Push to docker.io as well

See macbre/push-to-ghcr#9

Author: macbre

.github/workflows/push-to-ghcr.yml

@@ -1,4 +1,4 @@
-name: Build and publish a Docker image to ghcr.io
+name: Build and publish a Docker image to ghcr.io and Docker Hub
 on:
 
   # publish on releases (tagged as "x.y.z" - "v" prefix is removed)
@@ -23,3 +23,4 @@ jobs:
         with:
           image_name: macbre/nginx-http3
           github_token: ${{ secrets.GITHUB_TOKEN }}
+          docker_io_token: ${{ secrets.DOCKER_IO_ACCESS_TOKEN }}