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

@@ -115,6 +115,14 @@ jobs:
         distribution: temurin
         java-version: 11
         cache: gradle
+    - name: Setup Docker Buildx
+      uses: docker/setup-buildx-action@v2
+    - name: Build the Docker image
+      uses: docker/build-push-action@v3
+      with:
+        context: .
+        cache-from: type=gha
+        cache-to: type=gha,mode=max
     - name: Validate Batect wrapper scripts
       uses: batect/batect-wrapper-validation-action@v0
     - name: Run functional tests