ci: add smoke workflow against sdk_demo_backend

.github/workflows/smoke.yml

@@ -0,0 +1,95 @@
+name: Smoke
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  smoke:
+    name: PlayMode smoke vs sdk_demo_backend
+    runs-on: ubuntu-24.04
+    timeout-minutes: 30
+
+    steps:
+      - name: Check out asobi-unity (as embedded package)
+        uses: actions/checkout@v4
+        with:
+          path: _unity_project/Packages/com.asobi.sdk
+
+      - name: Check out sdk_demo_backend
+        uses: actions/checkout@v4
+        with:
+          repository: widgrensit/sdk_demo_backend
+          path: _backend
+
+      - name: Bring up sdk_demo_backend
+        run: docker compose up -d
+        working-directory: _backend
+
+      - name: Wait for backend
+        run: |
+          for i in $(seq 1 60); do
+            code=$(curl -s -o /dev/null -w "%{http_code}" -X POST \
+              -H 'content-type: application/json' \
+              -d '{}' http://localhost:8084/api/v1/auth/register || echo 000)
+            if [ "$code" != "000" ] && [ "$code" -lt 500 ]; then
+              echo "Backend reachable (HTTP $code)"
+              exit 0
+            fi
+            sleep 1
+          done
+          echo "Backend never became reachable"
+          exit 1
+
+      - name: Scaffold minimal Unity project
+        run: |
+          mkdir -p _unity_project/Assets _unity_project/ProjectSettings
+          cat > _unity_project/Packages/manifest.json <<'EOF'
+          {
+            "dependencies": {
+              "com.asobi.sdk": "file:com.asobi.sdk",
+              "com.unity.test-framework": "1.4.5",
+              "com.unity.ugui": "1.0.0"
+            },
+            "testables": [
+              "com.asobi.sdk"
+            ]
+          }
+          EOF
+          cat > _unity_project/ProjectSettings/ProjectVersion.txt <<'EOF'
+          m_EditorVersion: 2022.3.50f1
+          EOF
+
+      - name: Cache Unity Library
+        uses: actions/cache@v4
+        with:
+          path: _unity_project/Library
+          key: Library-${{ hashFiles('_unity_project/Packages/manifest.json', '_unity_project/Packages/com.asobi.sdk/**') }}
+          restore-keys: |
+            Library-
+
+      - name: Run PlayMode tests
+        uses: game-ci/unity-test-runner@v4
+        env:
+          UNITY_LICENSE: ${{ secrets.UNITY_LICENSE }}
+          UNITY_EMAIL: ${{ secrets.UNITY_EMAIL }}
+          UNITY_PASSWORD: ${{ secrets.UNITY_PASSWORD }}
+          ASOBI_URL: http://localhost:8084
+        with:
+          projectPath: _unity_project
+          unityVersion: 2022.3.50f1
+          testMode: playmode
+          customParameters: -nographics
+          githubToken: ${{ secrets.GITHUB_TOKEN }}
+          checkName: PlayMode test results
+
+      - name: Backend logs on failure
+        if: failure()
+        run: docker compose logs
+        working-directory: _backend
+
+      - name: Tear down sdk_demo_backend
+        if: always()
+        run: docker compose down -v
+        working-directory: _backend