feat(ci): add deployment workflow and update Dockerfile

.gitea/workflows/deploy.yml

@@ -3,7 +3,6 @@ on:
   push:
     branches:
       - "main"
-      - "feat/deployment"
     paths:
       - "backend/**"
   
@@ -13,9 +12,5 @@ jobs:
     name: Build Docker Image
     steps:
       - uses: actions/checkout@v4
-      - name: Build Image
-        run: docker buildx build -f .docker/Dockerfile -t git.kjan.de/SZUT/casino-backend:latest .
-      - name: Login
-        run: echo ${DOCKER_PASS} | docker login git.kjan.de --username ${DOCKER_USER} --password-stdin
-      - name Push
-        run: docker push git.kja.de/SZUT/casino-backend:latest
+      - name: Build Docker Image
+        run: docker buildx build -f .docker/Dockerfile -t git.kjan.de/SZUT/casino-backend .