build: fixes rpm verification.

.circleci/config.yml

@@ -150,6 +150,7 @@ jobs:
       - run:
           name: verify signed packages
           command: |
+            mkdir -p ~/.rpmdb/pubkeys
             curl https://grafanarel.s3.amazonaws.com/RPM-GPG-KEY-grafana > ~/.rpmdb/pubkeys/grafana.key
             ./scripts/build/verify_signed_packages.sh dist/*.rpm
       - run: