ci: push Docker images to DigitalOcean Container Registry (#7839)

.github/workflows/docker.yml

@@ -50,6 +50,12 @@ jobs:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Login to DigitalOcean Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: registry.digitalocean.com
+          username: ${{ secrets.DIGITALOCEAN_USERNAME }}
+          password: ${{ secrets.DIGITALOCEAN_ACCESS_TOKEN }}
       - name: Build and push images
         uses: docker/build-push-action@v5
         with:
@@ -59,6 +65,7 @@ jobs:
           tags: |
             gogs/gogs:latest
             ghcr.io/gogs/gogs:latest
+            registry.digitalocean.com/gogs/gogs:latest
       - name: Send email on failure
         uses: dawidd6/action-send-mail@v3
         if: ${{ failure() }}