dev:rebuild doesn't build a new container

[johrstrom]

Since we moved the dev container to nightlies - dev:rebuild no longer builds a new container. Instead it just uses the layers that have been cached because it does not recognize that anything has been updated. From it's perspective nothing has been updated even though we know there's a new RPM the build system does not regenerate the layer that pulls the RPMs.

┆Issue is synchronized with this Asana task by Unito

[treydock]

For Docker you'd use --no-cache with the build command to force full rebuild. Likely same flag with Podman.