[REQ] Add support for per-command mounts on image+cmd type

[cpuguy83]

What kind of request is this?

None

What is your request or suggestion?

Right now you can add mounts to image sources like:

sources:
  foo:
    image:
      cmd:
        mounts:
          # insert mounts here

The mounts get added to all steps defined in cmd.
The trouble here is now any command you run in the image is going to have its cache broken by any change to the mount content.
This means steps like installing some packages will always have to be re-run if the mount data changes even though the mount data does not affect that.

I propose that we can add support for adding mounts per cmd step.

Are you willing to submit PRs to contribute to this feature request?

• Yes, I am willing to implement it.