cache support

.github/workflows/docker.yml

@@ -19,6 +19,14 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
       
+      - name: Cache Docker layers
+        uses: actions/cache@v2
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v1 
         with:
@@ -32,10 +40,20 @@ jobs:
         with:
           push: true
           tags: ghcr.io/uetchy/uechi.io:latest
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache-new
           
       - name: Image digest
         run: echo ${{ steps.docker_build.outputs.digest }}
       
       - name: Trigger Watchtower Update
         run: |
-          curl -X POST -H "Authorization: Bearer ${{ secrets.WATCHTOWER_TOKEN }}" https://watchtower.uechi.dev/v1/update
+          curl -H "Authorization: Bearer ${{ secrets.WATCHTOWER_TOKEN }}" https://watchtower.uechi.dev/v1/update
+
+        # Temp fix
+        # https://github.com/docker/build-push-action/issues/252
+        # https://github.com/moby/buildkit/issues/1896
+      - name: Move cache
+        run: |
+          rm -rf /tmp/.buildx-cache
+          mv /tmp/.buildx-cache-new /tmp/.buildx-cache