* CI: Add Docker Hub authentication to ephemeral instances workflow Add Docker Hub login step to avoid unauthenticated image pull rate-limiting in the ephemeral-instances-pr-comment workflow. * Use the correct vault path
* CI: Add Docker Hub authentication to ephemeral instances workflow Add Docker Hub login step to avoid unauthenticated image pull rate-limiting in the ephemeral-instances-pr-comment workflow. * Use the correct vault path