Package release before publishing (#42218)

* Package separately to publish

* Fix interpolation

* Windows format envvars

* More descriptive msg

* Won't publish from here

* Resolve docker issues in PR build

* Rename package docker step

* Correct npm release JSON structure

scripts/drone/vault.star

@@ -1,6 +1,7 @@
 pull_secret = 'dockerconfigjson'
 github_token = 'github_token'
 drone_token = 'drone_token'
+prerelease_bucket = 'prerelease_bucket'
 
 def from_secret(secret):
     return {
@@ -22,4 +23,5 @@ def secrets():
         vault_secret(pull_secret, 'secret/data/common/gcr', '.dockerconfigjson'),
         vault_secret(github_token, 'infra/data/ci/github/grafanabot', 'pat'),
         vault_secret(drone_token, 'infra/data/ci/drone', 'machine-user-token'),
+        vault_secret(prerelease_bucket, 'infra/data/ci/grafana/prerelease', 'bucket'),
     ]