Add workflow to close low effort PRs

[ozh]

Hey @YOURLS/core,

Proposal to auto close those spam PRs.

This simple workflow, no dependency, simply checks the author's account age and the PR post length.

• If age < 7 days or body < 100 chars (one of these 2 conditions is enough), PR is automatically closed
• Bots, known contributors, are whitelisted

The workflow will not run in this PR branch, but here are its results in a test repo :

• Owner makes a PR with body too short : PR not closed
• Old account makes a PR with body too short: PR auto closed
• Fresh account makes a PR with detailed body: PR auto closed

Thoughts ?

Not willing to engage a measure/counter-measure/counter-counter-measure/etc... war with the spammers, but for the spam PR we've had lately, this should do OK

[ozh]

(Maybe name: Close low effort PRs isn't the best - a new account could legit make a fine PR. Will rename it Close suspicious PRs maybe)

[ozh]

Closing. See internal discussion https://github.com/YOURLS/.github-private/discussions/92