build: Switched to GHA cache (#1153)

.github/workflows/main.yml

@@ -15,6 +15,9 @@ on:
       - "[0-9]+.[0-9]+.[0-9]+-openj9-nightly"
       - "[0-9]+.[0-9]+.[0-9]+-adopt11"
 
+env:
+  IMAGE_TO_TEST: itzg/minecraft-server:test-${{ github.repository_owner }}-${{ github.run_id }}
+
 jobs:
   test:
     runs-on: ubuntu-20.04
@@ -54,20 +57,31 @@ jobs:
     - name: Setup Docker Buildx
       uses: docker/setup-buildx-action@v1
 
-    - name: Cache Docker layers
-      uses: actions/cache@v2.1.7
-      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_USER }}
         password: ${{ secrets.DOCKER_PASSWORD }}
 
+    - name: Build for test
+      uses: docker/build-push-action@v2.7.0
+      if: github.ref_name == 'master'
+      with:
+        context: .
+        platforms: linux/amd64
+        tags: ${{ env.IMAGE_TO_TEST }}
+        # ensure latest base image is used
+        pull: true
+        load: true
+        push: false
+        cache-from: type=gha
+        cache-to: type=gha,mode=max
+
+    - name: Run tests
+      if: github.ref_name == 'master'
+      run: |
+        tests/test.sh
+
     - name: Build and push
       id: docker_build
       uses: docker/build-push-action@v2.7.0
@@ -80,8 +94,8 @@ jobs:
         push: true
         # tags determined by prep step
         tags: ${{ steps.prep.outputs.tags }}
-        cache-from: type=local,src=/tmp/.buildx-cache
-        cache-to: type=local,dest=/tmp/.buildx-cache-new
+        cache-from: type=gha
+        cache-to: type=gha,mode=max
         labels: |
           org.opencontainers.image.documentation=https://github.com/itzg/docker-minecraft-server
           org.opencontainers.image.version=${{ steps.prep.outputs.version }}
@@ -90,11 +104,3 @@ jobs:
 
     - name: Image digest
       run: echo ${{ steps.docker_build.outputs.digest }}
-
-    - # 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