move up the gcp auth step

.github/workflows/central-controller.yaml

@@ -15,6 +15,11 @@ jobs:
     - name: checkout
       uses: actions/checkout@v4
   
+    - name: GCP Auth
+      uses: google-github-actions/auth@v2
+      with:
+        credentials_json: ${{ secrets.DOCKER_REGISTRY_WRITER}}
+  
     - name: Set up GCloud CLI
       uses: google-github-actions/setup-gcloud@v2
 
@@ -62,11 +67,6 @@ jobs:
     - name: Build
       run: |
         docker build -t us-central1-docker.pkg.dev/zerotier-421eb9/docker-images/ztcentral-controller:${{ env.COMMIT_SHORT_SHA }}-${{ steps.branch.outputs.branch_name }}-${{ runner.arch }} -f ext/central-controller-docker/Dockerfile.new .
-    - name: GCP Auth
-      uses: google-github-actions/auth@v2
-      with:
-        credentials_json: ${{ secrets.DOCKER_REGISTRY_WRITER}}
-
 
 
     - name: Build and push Docker Image