Add a Default Label option.

[vybhav72954]

There should be a default label option, which would be very helpful.

[Fionn Delahunty]

You could try setting the regex to . which should trigger on any written content.

[Armand Agopian]

Hi, after setting the regex to ., I still cannot set a default label. Here is an example:

example-label:
  - '.'

[IWANABETHATGUY]

Hi guys, https://github.com/github/issue-labeler/blob/e24a3eb6b2e28c8904d086302a2b760647f5f45c/src/main.ts#LL201C3-L213C4. I found this line, so if you want to match wildcard you should use /.*/ instead.

[Stephan Miehe]

Added to docs https://github.com/github/issue-labeler/blob/master/README.md#label-all-issues