FEAT(thanos): add Thanos for Prometheus HA

- Add Thanos Query, Store Gateway, Compactor
- Enable Prometheus Sidecar with S3 (MinIO) storage
- Configure OCI registry for Bitnami chart
- Fix Vault secret path and image settings
- Add nodeSelector for master node

thanos/manifests/secret.yaml

@@ -24,9 +24,9 @@ spec:
   data:
     - secretKey: access_key
       remoteRef:
-        key: secret/minio
-        property: root-user
+        key: minio
+        property: ROOT_USER
     - secretKey: secret_key
       remoteRef:
-        key: secret/minio
-        property: root-password
+        key: minio
+        property: ROOT_PASSWORD