Use GHA cache for docker image build.
diff --git a/.github/workflows/build_docker_image.yaml b/.github/workflows/build_docker_image.yaml
index a787a22..b954689 100644
--- a/.github/workflows/build_docker_image.yaml
+++ b/.github/workflows/build_docker_image.yaml
@@ -54,3 +54,5 @@
           platforms: linux/amd64,linux/arm64
           push: true
           tags: ghcr.io/apache/libcloud-site-dev:latest
+          cache-from: type=gha
+          cache-to: type=gha,mode=max