Fix overriding of alpine builder

[natalieparellano]

We need --pull-policy=always when the builder contains extensions (the builder must exist in a registry so that we can pull the manifest)

However pulling the remote builder overrides the locally built one, making our test useless and causing us to re-publish the builder that was already in Docker Hub

Spinning up a local registry should solve the problem

[natalieparellano]

CI failing with failed to fetch builder image 'index.docker.io/cnbs/sample-builder:jammy' - we can re-kick it when that deploy succeeds

[jjbustamante]

I will take a look at the circleci issue