ci: push image to Forgejo registry, pull from K3s

.forgejo/workflows/build-and-deploy.yaml

@@ -11,6 +11,7 @@ on:
       - 'hotfix/**'
 
 env:
+  REGISTRY: git.avisenna-engineering.de
   IMAGE: git.avisenna-engineering.de/keyvan/avisenna-landing-page
   VERSION: latest
   NAMESPACE: ${{ github.ref == 'refs/heads/main' && 'prod' || 'web' }}
@@ -29,8 +30,13 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Build Docker image
-        run: docker build -t $IMAGE:$VERSION .
+      - name: Login to Forgejo registry
+        run: echo "${{ secrets.REGISTRY_PASSWORD }}" | docker login $REGISTRY -u ${{ secrets.REGISTRY_USERNAME }} --password-stdin
+
+      - name: Build and push Docker image
+        run: |
+          docker build -t $IMAGE:$VERSION .
+          docker push $IMAGE:$VERSION
 
       - name: Deploy to Kubernetes
         run: |