get docker_username and docker_password from vault

.drone.yml

@@ -4050,6 +4050,18 @@ 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
@@ -4201,6 +4213,6 @@ kind: secret
 name: gcr_credentials
 ---
 kind: signature
-hmac: 8e64be13fcb6f9d60dc993aa0a22ea5b7943912e95a7a9fde31a8ab8de2652c8
+hmac: 571f5239458504f70c9a2132b89989c4cfc82f752d26dca3b300dae978d1645d
 
 ...

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",