Add dockerhub-description step to workflow

Author: bennettgoble

.github/workflows/ci.yaml

@@ -56,4 +56,13 @@ jobs:
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
           platforms: linux/amd64,linux/arm64
+
+      - name: Docker Hub Description
+        uses: secondlife-3p/dockerhub-description@v4
+        if: startsWith(github.ref, 'refs/tags/v')
+        with:
+          username: ${{ secrets.SHARED_DOCKERHUB_USER }}
+          password: ${{ secrets.SHARED_DOCKERHUB_TOKEN }}
+          repository: lindenlab/nginx-proxy
+          short-description: A basic reverse proxy sidecar