pipeline: fix GPC credentials usage

pipeline/pipeline.yml

@@ -10,12 +10,7 @@ shared:
         repository: cycloid/cycloid-toolkit
         tag: latest
     run:
-      path: /bin/sh
-      args:
-      - -ec
-      - |
-        /usr/bin/merge-stack-and-config
-        echo '((gcp_credentials_json))' > ${MERGE_OUTPUT_PATH}/credentials.json
+      path: /usr/bin/merge-stack-and-config
     outputs:
     - name: merged-stack
       path: "merged-stack"
@@ -49,7 +44,7 @@ resources:
     backend_config:
       bucket: ((terraform_storage_bucket_name))
       prefix: ((project))/((env))
-      # credentials: ((gcp_credentials_json))
+      credentials: ((gcp_credentials_json))
     vars:
       gcp_project: ((gcp_project))
       gcp_region: ((gcp_region))
@@ -60,7 +55,7 @@ resources:
       GOOGLE_PROJECT: ((gcp_project))
       GOOGLE_REGION: ((gcp_region))
       # GOOGLE_ZONE: ((gcp_zone))
-      GOOGLE_CREDENTIALS: merged-stack/credentials.json
+      GOOGLE_CREDENTIALS: ((gcp_credentials_json))
 
 # The Terraform stack (will be merged with the config)
 - name: git_stack-terraform