fix(release-notes-preview): add breaking changes doc check

This adds a new check that enforces that a breaking changes document has been created.

release-notes-preview/action.yaml

@@ -5,6 +5,10 @@ inputs:
     required: true
     description: GitHub token that can checkout the repository as well as create tags/releases against it. e.g. 'secrets.GITHUB_TOKEN'
     default: ${{ github.token }}
+  enforce-breaking-changes-docs:
+    required: false
+    description: Ensure that an appropriate `v<major-version>.md` doc has been created if there are breaking changes in the PR.
+    default: "true"
   extra-plugins:
     required: false
     description: Extra plugins for pre-install. You can also specify specifying version range for the extra plugins if you prefer.  Defaults to install @open-turo/semantic-release-config.
@@ -29,28 +33,30 @@ runs:
         state: open
     - name: Generate release notes
       id: release-notes-preview
-      uses: open-turo/actions-release/semantic-release@v2
+      uses: open-turo/actions-release/semantic-release@add-prerelease-support
       env:
         GITHUB_TOKEN: ${{ inputs.github-token }}
       with:
         branches: ${{ github.ref_name }}
         dry-run: true
         extra-plugins: ${{ inputs.extra-plugins }}
         semantic-version: ${{ inputs.semantic-version }}
+
+    # Add release notes preview to PR
     - name: Check for release notes comment
       uses: peter-evans/find-comment@v2
-      id: fc
+      id: fc-release-notes
       if: steps.find-pull-request.outputs.number != ''
       with:
         issue-number: ${{ steps.find-pull-request.outputs.number }}
         comment-author: "github-actions[bot]"
         body-includes: "<!-- release notes preview comment -->"
     - name: Delete previous release note
-      if: steps.fc.outputs.comment-id != ''
+      if: steps.fc-release-notes.outputs.comment-id != ''
       uses: jungwinter/comment@v1
       with:
         type: delete
-        comment_id: ${{ steps.fc.outputs.comment-id }}
+        comment_id: ${{ steps.fc-release-notes.outputs.comment-id }}
         token: ${{ inputs.github-token }}
     - name: Comment release notes preview
       uses: peter-evans/create-or-update-comment@v1
@@ -76,3 +82,71 @@ runs:
 
           If you are expecting a release, you will need to either fix a bug or add a feature.
           Chores, CI, docs, refactoring, style and other changes will not trigger a release.
+
+    # Ensure that a breaking changes doc has been created
+    - name: Check for breaking changes comment
+      uses: peter-evans/find-comment@v2
+      id: fc-breaking-changes
+      if: steps.find-pull-request.outputs.number != ''
+      with:
+        issue-number: ${{ steps.find-pull-request.outputs.number }}
+        comment-author: "github-actions[bot]"
+        body-includes: "<!-- breaking changes comment -->"
+    - name: Delete previous breaking changes comment
+      if: steps.fc-breaking-changes.outputs.comment-id != ''
+      uses: jungwinter/comment@v1
+      with:
+        type: delete
+        comment_id: ${{ steps.fc-breaking-changes.outputs.comment-id }}
+        token: ${{ inputs.github-token }}
+    - name: Comment missing breaking changes doc
+      uses: peter-evans/create-or-update-comment@v1
+      if: steps.release-notes-preview.outputs.new-release-published && inputs.enforce-breaking-changes-docs && ${{ steps.release-notes-preview.outputs.new-release-major-version }} != ${{ steps.release-notes-preview.outputs.last-release-major-version }} && ${{ hashFiles(format('docs/breaking-changes/v{0}.md', steps.release-notes-preview.outputs.new-release-major-version)) == '' }}
+      with:
+        issue-number: ${{ steps.find-pull-request.outputs.number }}
+        body: |
+          steps.release-notes-preview.outputs.new-release-published = ${{ steps.release-notes-preview.outputs.new-release-published }}
+          && inputs.enforce-breaking-changes-docs = ${{ inputs.enforce-breaking-changes-docs }}
+          && steps.release-notes-preview.outputs.new-release-major-version '${{ steps.release-notes-preview.outputs.new-release-major-version }}' != steps.release-notes-preview.outputs.last-release-major-version '${{ steps.release-notes-preview.outputs.last-release-major-version }}'
+          && ${{ hashFiles(format('docs/breaking-changes/v{0}.md', steps.release-notes-preview.outputs.new-release-major-version)) == '' }} '${{format('docs/breaking-changes/v{0}.md', steps.release-notes-preview.outputs.new-release-major-version)}}'
+
+          check: steps.release-notes-preview.outputs.new-release-major-version != steps.release-notes-preview.outputs.last-release-major-version == ${{ steps.release-notes-preview.outputs.new-release-major-version != steps.release-notes-preview.outputs.last-release-major-version }}
+          check: steps.release-notes-preview.outputs.new-release-major-version == steps.release-notes-preview.outputs.last-release-major-version == ${{ steps.release-notes-preview.outputs.new-release-major-version == steps.release-notes-preview.outputs.last-release-major-version }}
+
+          ## Error: missing breaking changes documentation
+          This pull request contains breaking changes, but no documentation has been added to `docs/breaking-changes/v${{ steps.release-notes-preview.outputs.new-release-major-version }}.md`.
+
+          <details>
+            <summary>Instructions for creating breaking changes document:</summary>
+
+          ```shell
+          mkdir -p docs/breaking-changes
+          cat <<EOF > docs/breaking-changes/v${{ steps.release-notes-preview.outputs.new-release-major-version }}.md
+          # Breaking changes in v${{ steps.release-notes-preview.outputs.new-release-major-version }}
+
+          [//]: # "Brief description of current major version release scope"
+
+          ## Description of changes
+
+          [//]: # "Elaborate and add context to help the developer understand the changes."
+
+          ## Upgrade instructions
+
+          [//]: # "Required and suggested prerequisites, example code, etc."
+
+          EOF
+          ```
+          </details>
+
+          ---
+          <!-- breaking changes comment -->
+    - name: Fail if we are checking for the breaking changes doc and it is missing
+      if: >
+        steps.release-notes-preview.outputs.new-release-published
+        && inputs.enforce-breaking-changes-docs
+        && steps.release-notes-preview.outputs.new-release-major-version != steps.release-notes-preview.outputs.last-release-major-version
+        && ${{ hashFiles(format('docs/breaking-changes/v{0}.md', steps.release-notes-preview.outputs.new-release-major-version)) == '' }}
+      shell: bash
+      run: |
+        echo "::error::Breaking changes document is missing. Expected: ``docs/breaking-changes/v${{ steps.release-notes-preview.outputs.new-release-major-version }}.md``"
+        exit 1