Use latest tag for backend deploys

.gitea/workflows/build-and-deploy.yml

@@ -11,7 +11,7 @@ jobs:
     env:
       SERVICE_NAME: backend
       IMAGE_SHA: gitea.dsrptlab.com/mapflow/backend:${{ github.sha }}
-      IMAGE_MAIN: gitea.dsrptlab.com/mapflow/backend:main
+      IMAGE_LATEST: gitea.dsrptlab.com/mapflow/backend:latest
       DOKPLOY_DEPLOY_WEBHOOK: http://sin.dsrptlab.com:3000/api/deploy/x3IYnQHykbR__LYwh0LPH
     steps:
       - uses: actions/checkout@v4
@@ -32,7 +32,7 @@ jobs:
           fi
           docker buildx use "$builder"
           docker buildx inspect --bootstrap
-          docker buildx build --push --provenance=false --tag "$IMAGE_SHA" --tag "$IMAGE_MAIN" .
+          docker buildx build --push --provenance=false --tag "$IMAGE_SHA" --tag "$IMAGE_LATEST" .
 
       - name: Skip stale deployment
         run: |