nginx: fix push, checkout, file context

.github/workflows/nginx.yml

@@ -17,6 +17,11 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+        with:
+          fetch-depth: 0
+
       - name: Login to AUVEM Registry
         uses: docker/login-action@v3
         with:
@@ -30,7 +35,9 @@ jobs:
       - name: Build and push
         uses: docker/build-push-action@v6
         with:
-          file: "{context}/nginx/Dockerfile"
+          context: .
+          file: ./nginx/Dockerfile
           tags: |
             gitea.auvem.com/auvem/wordpress-docker/auvem-nginx:latest
             gitea.auvem.com/auvem/wordpress-docker/auvem-nginx:${{ github.sha }}
+          push: true