Add github workflow to upload test failure markdown summary report

as a comment to PRs when tests fail

.github/workflows/run-tests.yml

@@ -416,11 +416,18 @@ jobs:
           mkdir -p /tmp/minio_tests/test-bucket && chmod -R 777 /tmp/minio_tests
           docker-compose -f .docker/$DOCKERFILE run qgis-deps /root/QGIS/.docker/docker-qgis-test.sh $TEST_BATCH
 
+      - name: Save PR number to test report
+        if: ${{ failure() }}
+        env:
+          PR_NUMBER: ${{ github.event.number }}
+        run: |
+          echo $PR_NUMBER > qgis_test_report/pr_number
+
       - name: Archive test results report
         if: ${{ failure() }}
         uses: actions/upload-artifact@v3
         with:
-          name: test-results-${{ matrix.distro-version }}-qt${{ matrix.qt-version }}
+          name: test-results-qt${{ matrix.qt-version }}
           path: qgis_test_report
 
   clang-tidy:

.github/workflows/write_failure_comment.yml

@@ -0,0 +1,55 @@
+name: Write test failure comment
+
+on:
+  workflow_run:
+    workflows: [🧪 QGIS tests]
+    types:
+      - completed
+
+jobs:
+  strategy:
+    matrix:
+      qt-version: [ 5, 6 ]
+
+  on-failure:
+    download:
+      runs-on: ubuntu-latest
+      steps:
+        - name: 'Download artifact'
+          uses: actions/github-script@v6
+          with:
+            script: |
+              let allArtifacts = await github.rest.actions.listWorkflowRunArtifacts({
+                 owner: context.repo.owner,
+                 repo: context.repo.repo,
+                 run_id: context.payload.workflow_run.id,
+              });
+              let matchArtifact = allArtifacts.data.artifacts.filter((artifact) => {
+                return artifact.name == "test-results-qt${{ matrix.qt-version }}"
+              })[0];
+              let download = await github.rest.actions.downloadArtifact({
+                 owner: context.repo.owner,
+                 repo: context.repo.repo,
+                 artifact_id: matchArtifact.id,
+                 archive_format: 'zip',
+              });
+              let fs = require('fs');
+              fs.writeFileSync(`${process.env.GITHUB_WORKSPACE}/test-results-qt${{ matrix.qt-version }}.zip`, Buffer.from(download.data));
+
+        - name: 'Unzip artifact'
+          run: unzip test-results-qt${{ matrix.qt-version }}.zip
+
+        - name: 'Post test report markdown summary as comment on PR'
+          uses: actions/github-script@v6
+          with:
+            github-token: ${{ secrets.GITHUB_TOKEN }}
+            script: |
+              let fs = require('fs');
+              let issue_number = Number(fs.readFileSync('./test-results-qt${{ matrix.qt-version }}'));
+              let body = String(fs.readFileSync('./summary.md'));
+              await github.rest.issues.createComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: issue_number,
+                body: body
+              });