build: fixes gcp push path.

.circleci/config.yml

@@ -403,7 +403,7 @@ jobs:
           command: '/opt/google-cloud-sdk/bin/gcloud auth activate-service-account --key-file=/tmp/gcpkey.json'
       - run:
           name: deploy to gcp
-          command: '/opt/google-cloud-sdk/bin/gsutil cp ./dist/* gs://R/oss/release'
+          command: '/opt/google-cloud-sdk/bin/gsutil cp ./dist/* gs://$GCP_BUCKET_NAME/oss/release'
       - run:
           name: Deploy to Grafana.com
           command: './scripts/build/publish.sh'