New --exclude directive from Dockerfile

[slinkydeveloper]

Feature request description

Dockerfile recently added support for the COPY --exclude parameter, see https://www.docker.com/blog/new-dockerfile-capabilities-v1-7-0/. Would it be possible to add it to podman too?

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[rhatdan]

This needs to bed enhanced in Buildah

Seems reasonable to me. But would require work in imagebuilder, I blieve.

@nalind @flouthoc WDYT?

[rhatdan]

If you were interested in opening a PR that would help this along.

[flouthoc]

Yes imagebuilder changes are needed afaics, I can give this a stab if @slinkydeveloper is not already working on this.

[nalind]

The imagebuilder parts should have landed in openshift/imagebuilder#285.

[rhatdan]

Nice so this just needs plumbing with buildah and then podman.

[github-actions]

A friendly reminder that this issue had no activity for 30 days.

[rhatdan]

@nalind @flouthoc any progress on this?

[nalind]

Yeah, the main stumbling block I hit is getting the conformance tests to pass, since they're turning up behavior which seems counterintuitive, to me at least, in a few cases.