Add GCP Credentials

.gitlab-ci.yml

@@ -35,9 +35,11 @@ gcloud:
   image:
     name: google/cloud-sdk:slim
     entrypoint: [""]
+  variables:
+    GOOGLE_CREDENTIALS: $SA_GCP_GITLAB
   script: |-
     gcloud version
-    gcloud auth login
+    gcloud iam service-accounts list
 
 link:
   stage: deploy