Upgrade RUNNER_IMAGES_VERSION to v0.0.4
What does this MR do?
Upgrades RUNNER_IMAGES_VERSION to v0.0.4 to fix a bug where the Runner ubuntu image no longer had a gitlab-runner user.
What's the best way to test this MR?
Check that the produced image has a gitlab-runner user with the uid 999.
What are the relevant issue numbers?
Closes #38503 (closed)