build: replace codecov with python-coverage-comment-action

.coveragerc

@@ -1,5 +1,6 @@
 [run]
 branch = True
+relative_files = True
 data_file = .coverage
 source=event_routing_backends
 omit =

.github/workflows/ci.yml

@@ -17,6 +17,14 @@ jobs:
         os: [ubuntu-20.04]
         python-version: ['3.8']
         toxenv: [quality, docs, pii_check, django32, django42]
+    permissions:
+      # Gives the action the necessary permissions for publishing new
+      # comments in pull requests.
+      pull-requests: write
+      # 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
 
     steps:
     - uses: actions/checkout@v4
@@ -38,7 +46,19 @@ jobs:
 
     - name: Run Coverage
       if: matrix.python-version == '3.8' && matrix.toxenv=='django42'
-      uses: codecov/codecov-action@v3
+      uses: py-cov-action/python-coverage-comment-action@v3
       with:
-        flags: unittests
-        fail_ci_if_error: true
+        GITHUB_TOKEN: ${{ github.token }}
+        MINIMUM_GREEN: 90
+        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