Add ability to automatically decompress zipped artifacts

[alexcapras]

Summary

Currently, the executer has the ability to automatically unpack tar-balled artifacts (.tar.gz). It might be nice to add the ability to do the same for zip files (.zip).

Motivation

Sometimes artifacts need to be zipped instead of tarred, but it's nice to still have the auto-unpack functionality.

Proposal

In executor.go, we check if an artifact is a tarball, using function isTarball and the artifact is untarred using untar. I propose we add similar functions for isZip and unzip to handle the zip usecase.

https://github.com/argoproj/argo/blob/cdc935ae76b3d7cc50a486695b40ff2f647b49bc/workflow/executor/executor.go#L184

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Message from the maintainers:

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[alexec]

Would you like to submit a PR for this feature?

[alexcapras]

just raised a PR: https://github.com/argoproj/argo/pull/4068/files