add report comment

Author: ndyakov

.github/workflows/build.yml

@@ -20,7 +20,26 @@ jobs:
       run: go mod tidy
     - name: Run tests with coverage
       run: go test ./... -coverprofile=./cover.out -covermode=atomic -coverpkg=./...
+    - name: Upload coverage
+      uses: actions/upload-artifact@v4
+      with:
+        name: code-coverage
+        path: cover.out # Make sure to use the same file name you chose for the "-coverprofile" in the "Test" step
     - name: Check coverage
       uses: vladopajic/go-test-coverage@v2
       with:
-        config: ./.testcoverage.yml
+        config: ./.testcoverage.yml
+  code_coverage:
+    name: "Code coverage report"
+    if: github.event_name == 'pull_request' # Do not run when workflow is triggered by push to main branch
+    runs-on: ubuntu-latest
+    needs: test # Depends on the artifact uploaded by the "unit_tests" job
+    permissions:
+      contents:      read
+      actions:       read  # to download code coverage results from "test" job
+      pull-requests: write # write permission needed to comment on PR
+    steps:
+      - uses: fgrosse/[email protected] # Consider using a Git revision for maximum security
+        with:
+          coverage-artifact-name: "code-coverage" # can be omitted if you used this default value
+          coverage-file-name: "cover.out" # can be omitted if you used this default value