add automated slack message

.github/actions/runner-slack-notification/action.yml

@@ -0,0 +1,45 @@
+name: Run the slack notification for various things
+description: This sends a slack notification
+
+inputs:
+  slack_channel:
+    description: 'The channel to send the slack message to'
+    required: true
+  slack_bot_token:
+    description: 'The slack bot token'
+    required: true
+  pull_request_number:
+    description: The number of the pull request
+    required: true
+runs:
+  using: composite
+  steps:
+  - name: Slack - Send a message
+    id: slack-message
+    uses: slackapi/slack-github-action@485a9d42d3a73031f12ec201c457e2162c45d02d # v2.0.0
+    with:
+      method: chat.postMessage
+      token: ${{ inputs.slack_bot_token }}
+      payload: |
+        "channel": "${{ inputs.slack_channel }}",
+        "text": "*GITHUB ACTIONS RUNNER*: upgrade PR has been created for *${{ github.event.repository.name }}*",
+          "blocks": [
+            {
+              "type": "section",
+              "fields": [
+                {
+                    "type": "mrkdwn",
+                    "text": "*Github Actions Runner PR - new runner available*"
+                }
+              ]
+            },
+            {
+              "type": "section",
+              "fields": [
+                {
+                  "type": "mrkdwn",
+                  "text": "*Pull Request:*\n<${{ github.server_url }}/${{ github.repository }}/pull/${{ inputs.pull_request_number }}/files|${{ github.event.repository.name }}/pull/${{ inputs.pull_request_number }}>"
+                }
+              ]
+            }
+          ]

.github/workflows/new_renovate_pr.yml

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+name: New PR created - Slack message if it's a renovate Dockerfile PR
+
+on:
+  pull_request:
+    types: [opened, reopened]
+
+jobs:
+  renovate_pr:
+    runs-on: [ ubuntu-latest ]
+    permissions:
+      contents: write
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v2
+    - name: Get PR details
+      id: get_pr_details
+      run: |
+        echo "::set-output name=title::$(jq -r .pull_request.title < $GITHUB_EVENT_PATH)"
+        echo "::set-output name=number::$(jq -r .pull_request.number < $GITHUB_EVENT_PATH)"
+    - name: Run action if PR title contains 'actions/runner'
+      if: contains(steps.get_pr_details.outputs.title, 'actions/runner')
+      uses: ./.github/actions/runner-slack-notification
+      with:
+        slack_channel: ${{ vars.NOTIFICATIONS_SLACK_CHANNEL }}
+        slack_bot_token: ${{ secrets.HMPPS_SRE_SLACK_BOT_TOKEN }}
+        pull_request_number:  ${{ steps.get_pr_details.outputs.number }}