try out vault secret plugin

Author: nkammah

.buildkite/build_pr_pipeline.yml

@@ -2,6 +2,12 @@ steps:
   - key: "build-pr-setup"
     label: "setup"
     command: ".buildkite/scripts/build_pr_commit_status.sh pending"
+    plugins:
+      - elastic/vault-secrets#v0.0.2:
+          path: "secret/ci/elastic-docs/docker.elastic.co" #"secret/ci/elastic-docs/docs_preview_cleaner"
+          field: "username" #"value"
+          env_var: "DOCKER_USERNAME" 
+
   - key: "build-pr"
     label: ":hammer: Build docs PR"
     command: echo "hello" #".buildkite/scripts/build_pr.sh"

.buildkite/scripts/build_pr_commit_status.sh

@@ -2,6 +2,8 @@
 
 set -euo pipefail
 
+echo $DOCKER_USERNAME
+
 # This hook should only be invoked for builds triggered by the Buildkite PR bot
 if [ -z ${GITHUB_PR_OWNER+set} ] || [ -z ${GITHUB_PR_REPO+set} ] || [ -z ${GITHUB_PR_TRIGGERED_SHA+set} ];then
   exit 0