I have a build rule in Bazel that brings up an in-memory Postgres server. When running this test, it has to run postgresql's initdb command. postgresql's initdb command has a hardcoded requirement that you can't run as the root user. There doesn't seem to be a flag or hook or configuration option that allows me to execute as another user either in the base image, or in the Cloud Builder yaml.

Affected builder image

gcr.io/cloud-builders/bazel

Expected Behavior

The tests aren't running as the root user

Actual Behavior

The tests are running as the root user

Steps to Reproduce the Problem

1. Create a cloudbuild.yaml

steps:
- name: gcr.io/cloud-builders/bazel
  entrypoint: whoami

2. See that it prints out root