admin.js

admin = db.getSiblingDB("admin")
admin.createUser(
  {
    user: "{{ env "DB_ADMIN_USER" }}",
    pwd: "{{ env "DB_ADMIN_PASS" }}",
    roles: [ { role: "userAdminAnyDatabase", db: "admin" } ]
  }
)

db.getSiblingDB("admin").auth("{{ env "DB_ADMIN_USER" }}", "{{ env "DB_ADMIN_PASS" }}" )

db.getSiblingDB("admin").createUser(
  {
    "user" : "{{ env "DB_REPLICA_ADMIN" }}",
    "pwd" : "{{ env "DB_REPLICA_ADMIN_PASS" }}",
    roles: [ { "role" : "clusterAdmin", "db" : "admin" } ]
  }
)