ci: add nginx-proxy version to image on build

.github/workflows/dockerhub.yml

@@ -53,12 +53,16 @@ jobs:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
+      - name: Retrieve version
+        run: echo "GIT_DESCRIBE=$(git describe --tags)" >> $GITHUB_ENV
+
       - name: Build and push the Debian based image
         id: docker_build_debian
         uses: docker/build-push-action@v2
         with:
           context: .
           file: Dockerfile
+          build-args: NGINX_PROXY_VERSION=${{ env.GIT_DESCRIBE }}
           platforms: linux/amd64,linux/arm64,linux/arm/v7
           push: true
           tags: ${{ steps.docker_meta_debian.outputs.tags }}
@@ -101,12 +105,16 @@ jobs:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
+      - name: Retrieve version
+        run: echo "GIT_DESCRIBE=$(git describe --tags)" >> $GITHUB_ENV
+
       - name: Build and push the Alpine based image
         id: docker_build_alpine
         uses: docker/build-push-action@v2
         with:
           context: .
           file: Dockerfile.alpine
+          build-args: NGINX_PROXY_VERSION=${{ env.GIT_DESCRIBE }}
           platforms: linux/amd64,linux/arm64,linux/arm/v7
           push: true
           tags: ${{ steps.docker_meta_alpine.outputs.tags }}