GitHub cache workaround (#14)

.github/workflows/main.yml

@@ -49,6 +49,9 @@ jobs:
 
   docker:
     runs-on: ubuntu-20.04
+    strategy:
+      matrix:
+        arch: [linux/amd64, linux/arm64]
     steps:
       - uses: actions/checkout@v2
       - name: Set up QEMU
@@ -59,27 +62,26 @@ jobs:
         uses: actions/[email protected]
         with:
           path: /tmp/.buildx-cache
-          key: ${{ runner.os }}-build-x-${{ github.sha }}
+          key: ${{ runner.os }}-build-x-${{ matrix.arch }}-${{ github.sha }}
           restore-keys: |
-            ${{ runner.os }}-build-x-
-      - name: Build AMD64
+            ${{ runner.os }}-build-x-${{ matrix.arch }}-
+      - name: Build
         uses: docker/build-push-action@v2
         with:
-          platforms: linux/amd64
+          platforms: ${{ matrix.arch }}
           push: false
           load: true
           tags: oittaa/gcp-storage-emulator:latest
           cache-from: type=local,src=/tmp/.buildx-cache
-          cache-to: type=local,dest=/tmp/.buildx-cache
-      - name: Build ARM64
-        uses: docker/build-push-action@v2
-        with:
-          platforms: linux/arm64
-          push: false
-          load: false
-          tags: oittaa/gcp-storage-emulator:latest
-          cache-from: type=local,src=/tmp/.buildx-cache
-          cache-to: type=local,dest=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache-new
+      -
+        # 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
       - name: Docker container up
         run: docker run -d --rm -p 8080:8080 --name gcp-storage-emulator oittaa/gcp-storage-emulator
       - name: Wait 10 seconds