First attempt to use go-coverage-report

.github/workflows/ci.yml

@@ -36,6 +36,9 @@ jobs:
       GH_REPO: ${{ github.repository }}
       GH_TOKEN: ${{ github.token }}
     steps:
+      - name: Install go-coverage-report
+        run: go install github.com/fgrosse/[email protected]
+
       - name: Determine changed files
         id: changed-files
         uses: tj-actions/changed-files@v42
@@ -64,7 +67,13 @@ jobs:
           path: new-coverage.txt
 
       - name: Compare code coverage results
-        run: 'echo "## Coverage report" > coverage-comment.md'
+        run: |
+          go-coverage-report \
+            -prefix=github.com/fgrosse/prioqueue \
+            old-coverage.txt \
+            new-coverage.txt \
+            .github/outputs/all_changed_files.json \
+          > coverage-comment.md
 
       - name: Comment on pull request
         run: gh pr comment ${{ github.event.number }} --body-file=coverage-comment.md