github/workflows: Enable Docker layer caching between builds

For details see [1].

[1]: https://github.com/docker/build-push-action/blob/master/docs/advanced/cache.md#github-cache

Signed-off-by: Sebastian Schuberth <sebastian.schuberth@bosch.io>

.github/workflows/build-and-test.yml

@@ -100,6 +100,14 @@ jobs:
         distribution: temurin
         java-version: 11
         cache: gradle
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v1
+    - name: Build the Docker image
+      uses: docker/build-push-action@v2
+      with:
+        context: .
+        cache-from: type=gha
+        cache-to: type=gha,mode=max
     - name: Run functional tests
       run: ./batect --enable-buildkit --config-var gradle_console=plain funTest -- -Dkotest.tags=!NoDockerTag -p analyzer
   funTest-analyzer-no-docker: