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Can a `docker_image` depend on another `docker_image` ? I.e. can we use pants to build a base image?

It looks like it can:
<https://github.com/pantsbuild/pants/blob/269aa343f0210a40f5a237d38ed7625e24143d3d/src/python/pants/backend/docker/util_rules/docker_build_context.py#L272-L297>

Probably easier to read is this test:
<https://github.com/pantsbuild/pants/blob/269aa343f0210a40f5a237d38ed7625e24143d3d/src/python/pants/backend/docker/util_rules/docker_build_context_test.py#L213-L247|https://github.com/pantsbuild/pants/blob/269aa343f0210a40f5a237d38ed7625e24143d3d/[…]on/pants/backend/docker/util_rules/docker_build_context_test.py>

I can't find higher level docs about this.

<@U01PZK60W2F> is the expert here and can chime in authoritatively when the sun comes up in his timezone.

John is spot on.

The docs are yet TBW, as this feature is new in 2.10.x and we haven’t started on those docs yet.

This is mentioned in the help for the `docker_image` target however: <https://github.com/pantsbuild/pants/blob/269aa343f0210a40f5a237d38ed7625e24143d3d/src/python/pants/backend/docker/target_types.py#L280-L299>