Use GitHub Actions for writing a stale action

[trivikr]

Is your feature request related to a problem? Please describe.
This came up in #28798 (comment) where we were planning to use stale bot

Describe the solution you'd like
Use GitHub Actions for writing a stale action (example)

Describe alternatives you've considered
Follow #28798 (comment)

[trivikr]

Configs discussed in #28798:

• daysUntilStale: 60
• daysUntilClose: 365

To avoid too many stale notifications at once, use skipCreatedBefore config and update it as described in #28798 (comment)

[jasnell]

Initially, I would go with a longer stale period. Let's say 90 to 120 days.

[trivikr]

The daysUntilStale value of 60 was guessed from the comment from @bnoordhuis in #28798 (comment)

Empirically, I'd say that > 50% of issues that have been dormant for a month, stay dormant.

The idea is post stale message every daysUntilStale days, till not activity (other than stale message) happens for daysUntilClose days - when issue/PR will be closed.

We can update daysUntilStale to 90/120 if 60 is too low.

[bnoordhuis]

I'm still +1 on this.

[targos]

@trivikr I think you should go ahead and open a PR

[trivikr]

I just got access to GitHub Actions Beta, and will experiment with it over the Labour Day weekend 😄

[trivikr]

I couldn't play with GitHub Actions during Labour Day weekend, and friends planned another trip this weekend.
I'll keep this open for another week, if anyone else wants to experiment.

[trivikr]

I'll be playing with GitHub actions over the weekend of 09/14

[trivikr]

Update: GitHub stale action is pretty new, and will need some time to get stable.

For example, the support for exempt labels was added on Aug 27 in actions/stale#11
Blog post describing experience with GitHub Actions https://evilmartians.com/chronicles/github-actions-first-impressions

[trivikr]

In Node.js core, we tried writing CI with GitHub Actions in #29193
But decided to wait till Actions goes stable in November as described in #29193 (comment)

[trivikr]

GitHub just added a new workflow editor for Actions
Details: https://github.blog/2019-10-01-new-workflow-editor-for-github-actions/