Also push to ghcr.io

.github/workflows/docker_deploy.yml

@@ -26,6 +26,19 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v3
+      - name: Login to Docker Hub
+        uses: docker/login-action@v2
+        if: github.event_name != 'pull_request'
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Login to GitHub registry
+        uses: docker/login-action@v2
+        if: github.event_name != 'pull_request'
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
       - name: Docker meta
         id: meta
         uses: docker/metadata-action@v4
@@ -33,6 +46,7 @@ jobs:
           # list of Docker images to use as base name for tags
           images: |
             mcranmer/pysr
+            ghcr.io/${{ github.repository }}
           # generate Docker tags based on the following events/attributes
           tags: |
             type=schedule
@@ -47,12 +61,6 @@ jobs:
         uses: docker/setup-qemu-action@v2
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2
-      - name: Login to Docker Hub
-        uses: docker/login-action@v2
-        if: github.event_name != 'pull_request'
-        with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
       - name: Build and push
         uses: docker/build-push-action@v3
         with: