fix build. (#1286)

Author: zetxqx

Makefile

@@ -211,7 +211,7 @@ image-build: ## Build the EPP image using Docker Buildx.
 
 .PHONY: image-push
 image-push: PUSH=--push ## Build the EPP image and push it to $IMAGE_REPO.
-image-push: MULTI=true image-build
+image-push: image-build
 
 .PHONY: image-load
 image-load: LOAD=--load ## Build the EPP image and load it in the local Docker registry.

cloudbuild.yaml

@@ -13,6 +13,7 @@ steps:
     - EXTRA_TAG=$_PULL_BASE_REF
     - DOCKER_BUILDX_CMD=/buildx-entrypoint
     - GIT_COMMIT_SHA=$_PULL_BASE_SHA
+    - MULTI=true
   - name: gcr.io/k8s-staging-test-infra/gcb-docker-gcloud:v20240718-5ef92b5c36
     entrypoint: make
     args: