ci: improve dev pipeline with Dokploy webhook and Docker layer caching

Kept our version over remote (security hardening PR #12) for all conflicts:
- pom.xml: Spring Boot 4.0.6 vs 3.4.1, new test deps
- SecurityConfig: new csrf/package API for SB4
- GlobalExceptionHandler: full handler set with SLF4J logging
- AppUserController/ExpenseListController: clean delegation to GlobalExceptionHandler
- Test files: SB4 package paths, extra test coverage

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

.gitea/workflows/build.yml

@@ -12,43 +12,45 @@ jobs:
     steps:
       # 1. Checkout the code
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
-      # 2. Set up Java and Maven
+      # 2. Set up Java and Maven (includes Maven, no separate install needed)
       - name: Set up JDK (Eclipse Temurin)
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
           distribution: "temurin"
           java-version: "17"
           cache: maven
 
-      # 3. Verify Maven installation
-      - name: Install Maven
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y maven
-          mvn -version
-
-      # 4. Build the Spring Boot application
+      # 3. Build the Spring Boot application
       - name: Build Spring Boot Application
-        run: |
-          mvn clean package -DskipTests
+        run: mvn clean package -DskipTests
 
-      # 5. Set up Docker
-      - name: Set up Docker
-        run: |
-          docker --version
+      # 4. Set up Docker Buildx (enables layer caching)
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
 
-      # 6. Build the Docker image
-      - name: Build and Package Docker Image
-        run: |
-          docker build -t tea.zendric.de/cedric/xpensely-server:latest .
-
-      # 7. Docker login
+      # 5. Docker login
       - name: Login to Docker Registry
+        uses: docker/login-action@v3
+        with:
+          registry: tea.zendric.de
+          username: ${{ secrets.TEAUSER }}
+          password: ${{ secrets.TEAPASSWORD }}
+
+      # 6. Build and push Docker image with layer caching
+      - name: Build and Push Docker Image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: tea.zendric.de/cedric/xpensely-server:latest
+          cache-from: type=registry,ref=tea.zendric.de/cedric/xpensely-server:buildcache
+          cache-to: type=registry,ref=tea.zendric.de/cedric/xpensely-server:buildcache,mode=max
+
+      # 7. Trigger Dokploy to redeploy the dev server automatically
+      - name: Trigger Dokploy Redeploy
         run: |
-          echo "${{ secrets.TEAPASSWORD }}" | docker login tea.zendric.de -u ${{ secrets.TEAUSER }} --password-stdin
-      # 8. Push Docker image
-      - name: Push the Docker Image to registry
-        run: |
-          docker push tea.zendric.de/cedric/xpensely-server:latest
+          curl -X POST "${{ secrets.DOKPLOY_WEBHOOK_URL }}" \
+            -H "Authorization: Bearer ${{ secrets.DOKPLOY_TOKEN }}" \
+            --fail