Feature request: Option for skipping recent artifacts

[gomorizsolt]

Issue #26.

Changes:

• the skip-recent option allows users to define the number of artifacts that should be prevented from the removal (even if they're older than the specified age)
• improvements (log the artifact's name alongside its id, created a map of the available options)

[thisismydesign]

CI falied

[thisismydesign]

Let's also include this in the example in the README. Let's comment out skip-tags and skip-recent there and mark them as optional.

[gomorizsolt]

Let's also include this in the example in the README. Let's comment out skip-tags and skip-recent there and mark them as optional.

Thanks, good point.

[gomorizsolt]

CI falied

Yep, it failed because the request quota was exceeded:

https://github.com/c-hive/gha-remove-artifacts/runs/648978726#step:7:28

Now it's fine. Though it's interesting since the requests are throttled.