ci: release workflow

.github/workflows/release.yml

@@ -0,0 +1,118 @@
+on:
+  push:
+    tags:
+      - "*/v*.*.*"
+
+name: "Release"
+
+jobs:
+  crate-info:
+    name: "Extract crate info"
+    runs-on: "ubuntu-latest"
+    outputs:
+      crate: ${{ steps.derive.outputs.crate }}
+      version: ${{ steps.derive.outputs.version }}
+
+    steps:
+      - id: "derive"
+        name: "Derive crate info from Git tag"
+        run: |
+          FULL_REF="${{ github.ref }}"
+          REGEX="^refs\/tags\/([a-z\\-]*)\/v(.*)$"
+          [[ $FULL_REF =~ $REGEX ]];
+
+          echo "crate=${BASH_REMATCH[1]}" >> $GITHUB_OUTPUT
+          echo "version=${BASH_REMATCH[2]}" >> $GITHUB_OUTPUT
+
+  # Just in case we accidentally release something not on master.
+  commit-branch-check:
+    name: "Check commit branch"
+    runs-on: "ubuntu-latest"
+    needs:
+      - "crate-info"
+
+    steps:
+      - name: "Checkout source code"
+        uses: "actions/checkout@v3"
+        with:
+          fetch-depth: 0
+
+      - name: "Check if commit is on master"
+        run: |
+          COMMIT_HASH=$(git log -1 --format=%H ${{ github.ref }})
+          GREP_OUTPUT=$(git log origin/master --format=%H | grep "$COMMIT_HASH")
+
+          if [ -z "$GREP_OUTPUT" ]; then
+            echo "Cannot release commits not on the master branch"
+            exit 1
+          fi
+
+  crate-version-check:
+    name: "Check crate version"
+    runs-on: "ubuntu-latest"
+    needs:
+      - "crate-info"
+
+    steps:
+      - name: "Checkout source code"
+        uses: "actions/checkout@v3"
+
+      - name: "Check against Cargo.toml"
+        run: |
+          cd ${{ needs.crate-info.outputs.crate }}
+          GREP_OUTPUT=$(cat Cargo.toml | grep "^version = \"${{ needs.crate-info.outputs.version }}\"$")
+
+          if [ -z "$GREP_OUTPUT" ]; then
+            echo "Crate version mismatch"
+            exit 1
+          fi
+
+  build:
+    name: "Build for ${{ matrix.os }}"
+    runs-on: "${{ matrix.os }}"
+    needs:
+      - "crate-info"
+
+    strategy:
+      matrix:
+        os:
+          - "ubuntu-latest"
+          - "windows-latest"
+          - "macos-latest"
+
+    steps:
+      - name: "Checkout source code"
+        uses: "actions/checkout@v3"
+
+      - name: "Setup stable toolchain"
+        uses: "actions-rs/toolchain@v1"
+        with:
+          toolchain: "stable"
+          profile: "minimal"
+          override: true
+
+      - name: "Build crate"
+        run: |
+          cargo build --package ${{ needs.crate-info.outputs.crate }} --all-targets
+
+  crates-io-release:
+    name: "Release to crates.io"
+    runs-on: "ubuntu-latest"
+
+    needs:
+      - "crate-info"
+      - "commit-branch-check"
+      - "crate-version-check"
+      - "build"
+
+    steps:
+      - name: "Checkout source code"
+        uses: "actions/checkout@v3"
+
+      - name: "Login to crates.io"
+        run: |
+          cargo login ${{ secrets.CRATES_IO_API_TOKEN }}
+
+      - name: "Publish crate"
+        run: |
+          cargo publish --package ${{ needs.crate-info.outputs.crate }}