[FEATURE REQUEST] - Don't download cache if it exists

[calvinbui]

By editing Buildkite's git-clean-flags we can exclude cache files or directories from being removed during checkout. If this is so, this plugin could check if the cache files/folders already exist and skip restoring it.

This could be done with a key like skip_restore_existing or something.

[gencer]

Yup! Great idea.

I will prepare after other pending bug.

[gencer]

I've evaluated possible use cases and, I'm not sure If checking existing directories are reliable or not. For example, you may change cache folders on next builds which leads to incorrect match. However, It is still possible to do so. I'll handle this on v2.5.0. Feel free to send your PR if you have any proposal.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[gencer]

Not stale.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[gencer]

Not stale

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.