Entrypoint permissions can be set on COPY (#211)

.github/workflows/test.yml

@@ -11,10 +11,20 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
       - name: Build Docker Image
+        env:
+          DOCKER_BUILDKIT: '1'
         run: docker build . -t offen/docker-volume-backup:test
+
       - name: Run Tests
         working-directory: ./test
         run: |
+          # Stop the buildx container so the tests can make assertions
+          # about the number of running containers
+          docker rm -f $(docker ps -aq)
           export GPG_TTY=$(tty)
           ./test.sh test