ci: add CD pipeline with Docker Hub push on pre-prod

.github/workflows/backend-build.yml

@@ -2,13 +2,13 @@ name: Backend - Build & Lint
 
 on:
     push:
-        branches: [main]
+        branches: [pre-prod]
         paths:
-            - "backend/**/**"
+            - "backend/**"
     pull_request:
-        branches: [main]
+        branches: [pre-prod]
         paths:
-            - "backend/**/**"
+            - "backend/**"
 
 jobs:
     lint:
@@ -54,9 +54,40 @@ jobs:
               working-directory: backend/gestion
               run: go build -v ./...
 
-            - name: Upload binary
-              uses: actions/upload-artifact@v4
+    docker:
+        name: Docker Build & Push
+        needs: build
+        runs-on: ubuntu-latest
+        if: github.event_name == 'push' && github.ref == 'refs/heads/pre-prod'
+
+        steps:
+            - uses: actions/checkout@v4
+
+            - name: Set up Docker Buildx
+              uses: docker/setup-buildx-action@v3
+
+            - name: Login to Docker Hub
+              uses: docker/login-action@v3
               with:
-                  name: backend-binary
-                  path: backend/gestion/gestion
-                  retention-days: 7
+                  username: ${{ secrets.DOCKERHUB_USERNAME }}
+                  password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+            - name: Build & push backend (runtime)
+              uses: docker/build-push-action@v6
+              with:
+                  context: .
+                  file: docker/backend/Dockerfile
+                  target: runtime
+                  push: true
+                  tags: |
+                      xor1234/backend-mln:latest
+
+            - name: Build & push WAF
+              uses: docker/build-push-action@v6
+              with:
+                  context: .
+                  file: docker/backend/Dockerfile
+                  target: waf
+                  push: true
+                  tags: |
+                      xor1234/backend-mln:waf