add ghcr repo, build caching

.github/workflows/hub.yml

@@ -17,12 +17,27 @@ jobs:
       -
         name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
+      -
+        name: Set up build cache
+        uses: actions/cache@v2
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
       -
         name: Login to DockerHub
         uses: docker/login-action@v1 
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Login to GitHub
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GHCR_TOKEN }}
       -
         name: Build and push
         uses: docker/build-push-action@v2
@@ -32,6 +47,10 @@ jobs:
           #platforms: linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64
           platforms: linux/amd64,linux/arm64,linux/arm/v6,linux/arm/v7
           push: true
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache
           tags: |
             akhilrex/podgrab:latest
             akhilrex/podgrab:1.0.0
+            ghcr.io/akhilrex/podgrab:latest
+            ghcr.io/akhilrex/podgrab:1.0.0