[Feature]: Add support for "buildx build --push" and/or "buildx build --output=type=registry"

[matskiv]

Feature request description

Please add support for the "buildx build --push" and/or "buildx build --output=type=registry" flags which would ensure that the built image is pushed to the registry. According to the buildx reference, the --push flag is just shorthand for --output=type=registry. So IMHO implementing both these things would be ideal, but I will be happy with either one.

Suggest potential solution

A clear and concise description of what you want to happen.

Have you considered any alternatives?

When using the CLI manually, I can of course use a separate command to push the image, this feature would help in integration with other tools - I am using DevSpace CLI tool which, in some cases, calls docker build build via CLI, and it relies on the --push flag. And so far this is the only compatibility problem that I found when using podman(with podman-docker).

Additional context

I may be able to contribute a PR if you think this is not to complex, and can give me a couple of pointers in the right direction. :)

[rhatdan]

Would love to get a commit from you.
You should be able to do most of this in
cmd/podman/images/build.go and buildx.go

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[rhatdan]

@flouthoc got some time to look at this?

[flouthoc]

I'll take a look at this.

[danishprakash]

@flouthoc If you haven't started already, I'd like to take a shot at this.

[flouthoc]

@danishprakash Sure feel free to take it.

[flouthoc]

@danishprakash In case if you go short on time, feel free to assign it back to me anytime :)

[danishprakash]

You should be able to do most of this in
cmd/podman/images/build.go and buildx.go

Just starting here but shouldn't this be moved to containers/buildah given the actual changes would be made there and perhaps the flags to be moved here once that's done? Or am I missing something?

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[rhatdan]

@danishprakash @flouthoc What is the state of this one?

[danishprakash]

Could you take a look at some of my comments on the PR for this? Whenever you've a moment, thanks!

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[flouthoc]

Being Implemented here: #4677

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