Add automated release workflow

.github/actions/get-prerelease/action.yml

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+name: Return a boolean indicating if the version contains prerelease identifiers
+
+#
+# Returns a simple true/false boolean indicating whether the version indicates it's a prerelease or not.
+#
+# TODO: Remove once the common repo is public.
+#
+
+inputs:
+  version:
+    required: true
+
+outputs:
+  prerelease:
+    value: ${{ steps.get_prerelease.outputs.PRERELEASE }}
+
+runs:
+  using: composite
+
+  steps:
+    - id: get_prerelease
+      shell: bash
+      run: |
+        if [[ "${VERSION}" == *"beta"* || "${VERSION}" == *"alpha"* ]]; then
+          echo "PRERELEASE=true" >> $GITHUB_OUTPUT
+        else
+          echo "PRERELEASE=false" >> $GITHUB_OUTPUT
+        fi
+      env:
+        VERSION: ${{ inputs.version }}

.github/actions/get-release-notes/action.yml

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+name: Return the release notes extracted from the PR body
+
+#
+# Returns the release notes from the content of a pull request linked to a release branch. It expects the branch name to be in the format release/vX.Y.Z, release/X.Y.Z, release/vX.Y.Z-beta.N. etc.
+#
+# TODO: Remove once the common repo is public.
+#
+inputs:
+  version:
+    required: true
+  repo_name:
+    required: false
+  repo_owner:
+    required: true
+  token:
+    required: true
+
+outputs:
+  release-notes:
+    value: ${{ steps.get_release_notes.outputs.RELEASE_NOTES }}
+
+runs:
+  using: composite
+
+  steps:
+    - uses: actions/github-script@v7
+      id: get_release_notes
+      with:
+        result-encoding: string
+        script: |
+          const { data: pulls } = await github.rest.pulls.list({
+            owner: process.env.REPO_OWNER,
+            repo: process.env.REPO_NAME,
+            state: 'all',
+            head: `${process.env.REPO_OWNER}:release/${process.env.VERSION}`,
+          });
+          core.setOutput('RELEASE_NOTES', pulls[0].body);
+      env:
+        GITHUB_TOKEN: ${{ inputs.token }}
+        REPO_OWNER: ${{ inputs.repo_owner }}
+        REPO_NAME: ${{ inputs.repo_name }}
+        VERSION: ${{ inputs.version }}

.github/actions/get-version/action.yml

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+name: Return the version extracted from the branch name
+
+#
+# Returns the version from the .version file.
+#
+# TODO: Remove once the common repo is public.
+#
+
+inputs:
+  working-directory:
+    default: './'
+
+outputs:
+  version:
+    value: ${{ steps.get_version.outputs.VERSION }}
+
+runs:
+  using: composite
+
+  steps:
+    - id: get_version
+      shell: bash
+      working-directory: ${{ inputs.working-directory }}
+      run: |
+        VERSION=$(head -1 .version)
+        echo "VERSION=${VERSION}" >> $GITHUB_OUTPUT

.github/actions/nuget-publish/action.yml

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+name: Publish release to NuGet
+
+inputs:
+  dotnet-version:
+    required: true
+  nuget-token:
+    required: true
+  project-path:
+    required: true
+  nuget-directory:
+    required: true
+  nuspec-file:
+    required: true
+
+runs:
+  using: composite
+  steps:
+    - name: Setup .NET
+      uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: ${{ inputs.dotnet-version }}
+
+    - name: Setup NuGet
+      uses: nuget/setup-nuget@v1
+
+    - name: Create NuGet packages
+      shell: pwsh
+      run: nuget pack ${{ inputs.nuspec-file }} -OutputDirectory ${{ inputs.nuget-directory }}
+
+    - name: Publish NuGet packages
+      shell: pwsh
+      run: |
+        foreach($file in (Get-ChildItem "${{ inputs.nuget-directory }}" -Recurse -Include *.nupkg)) {
+            nuget push $file -ApiKey "${{ inputs.nuget-token }}" -Source https://api.nuget.org/v3/index.json -SkipDuplicate -NonInteractive
+        }
+

.github/actions/nuget-release/action.yml

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+name: Create NuGet and GitHub Release
+
+
+### TODO: Replace instances of './.github/actions/' w/ `auth0/dx-sdk-actions` and append `@latest` after the common `dx-sdk-actions` repo is made public.
+### DO NOT replace nuget-publish, but keep the local version as it is slightly different as opposed to the one in auth0/dx-sdk-actions to support the mono repository structure.
+
+inputs:
+  dotnet-version:
+    required: true
+  nuget-token:
+    required: true
+  github-token:
+    required: true
+  project-path:
+    required: true
+  nuget-directory:
+    required: true
+  nuspec-file:
+    required: true
+  tag-prefix:
+    default: ''
+
+runs:
+  using: composite
+  steps:
+    # Get the version from the branch name
+    - id: get_version
+      uses: ./.github/actions/get-version
+      with:
+        working-directory: ${{ inputs.project-path }}
+
+    # Get the prerelease flag from the branch name
+    - id: get_prerelease
+      uses: ./.github/actions/get-prerelease
+      with:
+        version: ${{ steps.get_version.outputs.version }}
+
+    # Get the release notes
+    - id: get_release_notes
+      uses: ./.github/actions/get-release-notes
+      with:
+        token: ${{ inputs.github-token }}
+        version: ${{ inputs.tag-prefix }}${{ steps.get_version.outputs.version }}
+        repo_owner: ${{ github.repository_owner }}
+        repo_name: ${{ github.event.repository.name }}
+
+    # Check if the tag already exists
+    - id: tag_exists
+      uses: ./.github/actions/tag-exists
+      with:
+        tag: ${{ inputs.tag-prefix }}${{ steps.get_version.outputs.version }}
+        token: ${{ inputs.github-token }}
+
+    # Publish the release to our package manager
+    - uses: ./.github/actions/nuget-publish
+      if: steps.tag_exists.outputs.exists == 'false'
+      with:
+        dotnet-version: ${{ inputs.dotnet-version }}
+        project-path: ${{ inputs.project-path }}
+        nuget-token: ${{ inputs.nuget-token }}
+        nuget-directory: ${{ inputs.nuget-directory }}
+        nuspec-file: ${{ inputs.nuspec-file }}
+
+    # Create a release for the tag
+    - uses: ./.github/actions/release-create
+      if: steps.tag_exists.outputs.exists == 'false'
+      with:
+        token: ${{ inputs.github-token }}
+        name: ${{ steps.get_version.outputs.version }}
+        # body: ${{ steps.get_release_notes.outputs.release-notes }}
+        body: ''
+        tag: ${{ inputs.tag-prefix }}${{ steps.get_version.outputs.version }}
+        commit: ${{ github.sha }}
+        prerelease: ${{ steps.get_prerelease.outputs.prerelease }}

.github/actions/release-create/action.yml

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+name: Create a GitHub release
+
+#
+# Creates a GitHub release with the given version.
+#
+# TODO: Remove once the common repo is public.
+#
+
+inputs:
+  token:
+    required: true
+  files:
+    required: false
+  name:
+    required: true
+  body:
+    required: true
+  tag:
+    required: true
+  commit:
+    required: true
+  draft:
+    default: false
+    required: false
+  prerelease:
+    default: false
+    required: false
+  fail_on_unmatched_files:
+    default: true
+    required: false
+
+runs:
+  using: composite
+
+  steps:
+    - uses: softprops/action-gh-release@de2c0eb89ae2a093876385947365aca7b0e5f844
+      with:
+        body: ${{ inputs.body }}
+        name: ${{ inputs.name }}
+        tag_name: ${{ inputs.tag }}
+        target_commitish: ${{ inputs.commit }}
+        draft: ${{ inputs.draft }}
+        prerelease: ${{ inputs.prerelease }}
+        fail_on_unmatched_files: ${{ inputs.fail_on_unmatched_files }}
+        files: ${{ inputs.files }}
+      env:
+        GITHUB_TOKEN: ${{ inputs.token }}

.github/actions/tag-exists/action.yml

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+name: Return a boolean indicating if a tag already exists for the repository
+
+#
+# Returns a simple true/false boolean indicating whether the tag exists or not.
+#
+# TODO: Remove once the common repo is public.
+#
+
+inputs:
+  token:
+    required: true
+  tag:
+    required: true
+
+outputs:
+  exists:
+    description: 'Whether the tag exists or not'
+    value: ${{ steps.tag-exists.outputs.EXISTS }}
+
+runs:
+  using: composite
+
+  steps:
+    - id: tag-exists
+      shell: bash
+      run: |
+        GET_API_URL="https://api.github.com/repos/${GITHUB_REPOSITORY}/git/ref/tags/${TAG_NAME}"
+        http_status_code=$(curl -LI $GET_API_URL -o /dev/null -w '%{http_code}\n' -s -H "Authorization: token ${GITHUB_TOKEN}")
+        if [ "$http_status_code" -ne "404" ] ; then
+          echo "EXISTS=true" >> $GITHUB_OUTPUT
+        else
+          echo "EXISTS=false" >> $GITHUB_OUTPUT
+        fi
+      env:
+        TAG_NAME: ${{ inputs.tag }}
+        GITHUB_TOKEN: ${{ inputs.token }}

.github/workflows/nuget-release.yml

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+name: Create NuGet and GitHub Release
+
+on:
+  workflow_call:
+    inputs:
+      dotnet-version:
+        default: '6.0.x'
+        type: string
+      project-path:
+        required: true
+        type: string
+      tag-prefix:
+        default: ''
+        type: string
+      nuspec-file:
+        type: string
+        required: true
+    secrets:
+      github-token:
+        required: true
+      nuget-token:
+        required: true
+
+jobs:
+  release:
+    if: github.event_name == 'workflow_dispatch' || (github.event_name == 'pull_request' && github.event.pull_request.merged && startsWith(github.event.pull_request.head.ref, 'release/'))
+    runs-on: windows-latest
+    environment: release
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+
+    - uses: actions/download-artifact@v4
+      with:
+        path: './src'
+        name: build
+
+    - id: release_ios
+      uses: ./.github/actions/nuget-release
+      with:
+        dotnet-version: ${{ inputs.dotnet-version }}
+        project-path: ${{ inputs.project-path }}
+        tag-prefix: ${{ inputs.tag-prefix }}
+        nuget-directory: ${{ inputs.project-path }}/nuget
+        nuget-token: ${{ secrets.nuget-token }}
+        github-token: ${{ secrets.github-token }}
+        nuspec-file: ${{ inputs.nuspec-file }}