get docker_username and docker_password from vault

.drone.yml

@@ -4553,6 +4553,18 @@ get:
 kind: secret
 name: prerelease_bucket
 ---
+get:
+  name: username
+  path: infra/data/ci/grafanaci-docker-hub
+kind: secret
+name: docker_username
+---
+get:
+  name: password
+  path: infra/data/ci/grafanaci-docker-hub
+kind: secret
+name: docker_password
+---
 get:
   name: credentials.json
   path: infra/data/ci/grafana/releng/artifacts-uploader-service-account
@@ -4686,6 +4698,6 @@ kind: secret
 name: gcr_credentials
 ---
 kind: signature
-hmac: 40be7d7c4f36407f4e84b97724322a0a101e1466db84f09e8e984f82354c85ef
+hmac: d5627bcb7896a671be78594ba913e74b50d8aabfcdddff45513b647eb711b743
 
 ...

scripts/drone/vault.star

@@ -41,6 +41,8 @@ def secrets():
         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"),
+        vault_secret("docker_username", "infra/data/ci/grafanaci-docker-hub", "username"),
+        vault_secret("docker_password", "infra/data/ci/grafanaci-docker-hub", "password"),
         vault_secret(
             gcp_upload_artifacts_key,
             "infra/data/ci/grafana/releng/artifacts-uploader-service-account",