Push images to ghcr.io

Alternative container registries like ghcr.io are a good option for anyone
seeking to avoid things like docker hub's latest changes to rate limiting

.github/workflows/buildx.yml

@@ -24,10 +24,17 @@ jobs:
         uses: crazy-max/ghaction-docker-buildx@v1
         with:
           version: latest
-      - name: log in to docker hub
-        run: |
-          echo "${{ secrets.DOCKER_PASSWORD }}" | \
-            docker login -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin
+      - name: Login to Docker Hub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: Login to ghcr.io
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
       - name: build and push the image
         if: startsWith(github.ref, 'refs/heads/main') && github.actor == 'benbusby'
         run: |
@@ -36,6 +43,9 @@ jobs:
           docker buildx build --push \
             --tag benbusby/whoogle-search:latest \
             --platform linux/amd64,linux/arm/v7,linux/arm64 .
+          docker buildx build --push \
+            --tag ghcr.io/benbusby/whoogle-search:latest \
+            --platform linux/amd64,linux/arm/v7,linux/arm64 .
       - name: build and push tag
         if: startsWith(github.ref, 'refs/tags')
         run: |
@@ -44,3 +54,6 @@ jobs:
           docker buildx build --push \
             --tag benbusby/whoogle-search:${GITHUB_REF#refs/*/v}\
             --platform linux/amd64,linux/arm/v7,linux/arm64 .
+          docker buildx build --push \
+            --tag ghcr.io/benbusby/whoogle-search:${GITHUB_REF#refs/*/v}\
+            --platform linux/amd64,linux/arm/v7,linux/arm64 .