ci: enhance GitHub Actions with JUnit test reporting (#88)

Add installation of go-junit-report to generate JUnit XML test reports
from Go test output. Upload these test results alongside coverage data to
Codecov for improved test reporting and analysis. Ensure uploads run only
if the workflow is not cancelled. This improves CI visibility and debugging.

Author: SVilgelm

.github/workflows/checks.yaml

@@ -24,11 +24,20 @@ jobs:
       - uses: actions/setup-go@v5.5.0 # immutable action, safe to use a version instead of hashtag
         with:
           go-version-file: go.mod
+      - run: go install github.com/jstemmer/go-junit-report/v2@latest
       - run: go test -race -cover -coverprofile=coverage.out -covermode=atomic
-      - name: Codecov
+      - run: go test -json 2>&1 | go-junit-report -parser gojson > junit.xml
+        if: always()
+      - name: Upload coverage reports to Codecov
+        if: ${{ !cancelled() }}
         uses: codecov/codecov-action@18283e04ce6e62d37312384ff67231eb8fd56d24 # v5.4.3
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+      - name: Upload test results to Codecov
+        if: ${{ !cancelled() }}
+        uses: codecov/test-results-action@f2dba722c67b86c6caa034178c6e4d35335f6706 # v1.1.0
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
 
   GolangCI-Lint:
     runs-on: ubuntu-latest