refactor: add different workflow to post comment in PR

.github/workflows/ci.yml

@@ -21,13 +21,10 @@ jobs:
       # Gives the action the necessary permissions for publishing new
       # comments in pull requests.
       pull-requests: write
-      # Gives the action the necessary permissions for editing existing
+      # Gives the action the necessary permissions for pushing data to the
+      # python-coverage-comment-action branch, and for editing existing
       # comments (to avoid publishing multiple comments in the same PR)
       contents: write
-      # Gives the action the necessary permissions for looking up the
-      # workflow that launched this workflow, and download the related
-      # artifact that contains the comment to be published
-      actions: read
 
     steps:
       - uses: actions/checkout@v4
@@ -48,6 +45,7 @@ jobs:
         run: tox
 
       - name: Report coverage
+        id: coverage_comment
         if: matrix.python-version == '3.8' && matrix.toxenv == 'django32'
         uses: py-cov-action/python-coverage-comment-action@v3
         with:
@@ -56,3 +54,12 @@ jobs:
           MINIMUM_ORANGE: 85
           ANNOTATE_MISSING_LINES: true
           ANNOTATION_TYPE: error
+
+      - name: Store Pull Request comment to be posted
+        uses: actions/upload-artifact@v4
+        if: steps.coverage_comment.outputs.COMMENT_FILE_WRITTEN == 'true'
+        with:
+          # If you use a different name, update COMMENT_ARTIFACT_NAME accordingly
+          name: python-coverage-comment-action
+          # If you use a different name, update COMMENT_FILENAME accordingly
+          path: python-coverage-comment-action.txt

.github/workflows/coverage.yml

@@ -0,0 +1,36 @@
+# .github/workflows/coverage.yml
+name: Post coverage comment
+
+on:
+  workflow_run:
+    workflows: ["Python CI"]
+    types:
+      - completed
+
+jobs:
+  test:
+    name: Run tests & display coverage
+    runs-on: ubuntu-latest
+    if: github.event.workflow_run.event == 'pull_request' && github.event.workflow_run.conclusion == 'success'
+    permissions:
+      # Gives the action the necessary permissions for publishing new
+      # comments in pull requests.
+      pull-requests: write
+      # Gives the action the necessary permissions for editing existing
+      # comments (to avoid publishing multiple comments in the same PR)
+      contents: write
+      # Gives the action the necessary permissions for looking up the
+      # workflow that launched this workflow, and download the related
+      # artifact that contains the comment to be published
+      actions: read
+    steps:
+      # DO NOT run actions/checkout here, for security reasons
+      # For details, refer to https://securitylab.github.com/research/github-actions-preventing-pwn-requests/
+      - name: Post comment
+        uses: py-cov-action/python-coverage-comment-action@v3
+        with:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_PR_RUN_ID: ${{ github.event.workflow_run.id }}
+          # Update those if you changed the default values:
+          # COMMENT_ARTIFACT_NAME: python-coverage-comment-action
+          # COMMENT_FILENAME: python-coverage-comment-action.txt