ci: add e2e test job to CI workflow

Runs e2eTest as a separate job on push/PR to main and jetty branches.
Unit tests (build-and-test) still run on every branch push.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: coopernetes

.github/workflows/ci.yml

@@ -28,3 +28,32 @@ jobs:
           name: test-reports
           path: "**/build/reports/tests/test/"
           retention-days: 14
+
+  e2e-test:
+    runs-on: ubuntu-latest
+    # E2E tests spin up containers; only run on push/PR to the main branches
+    # to avoid burning minutes on every feature branch commit.
+    if: >
+      github.ref == 'refs/heads/main' ||
+      github.ref == 'refs/heads/jetty' ||
+      github.event_name == 'pull_request'
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 21
+          cache: gradle
+
+      - name: Run e2e tests
+        run: ./gradlew :jgit-proxy-server:e2eTest
+
+      - name: Publish e2e test results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: e2e-test-reports
+          path: "jgit-proxy-server/build/reports/tests/e2eTest/"
+          retention-days: 14