add action that opens the PRs for us

[aduh95]

There are cases (e.g. when working on a release) where the current process is kinda slow, and we could speed it up by having the automation create the PR for us.

Having a workflow that can be triggered from the CLI would fix that.

# Create a PR for a post:
gh workflow run create-pr.yml --repo "https://github.com/nodejs/bluesky" \
  -F prTitle='vx.x.x release announcement' \
  -F richText='Node.js vx.x.x is out. Check the blog post at https://nodejs.org/…. TL;DR is

- New feature
- …'

# Create a PR for a retweet:
gh workflow run create-pr.yml --repo "https://github.com/nodejs/bluesky" \
  -F prTitle='Retweet vx.x.x release announcement' -F postURL=…

# Create a PR for a quote-RT:
gh workflow run create-pr.yml --repo "https://github.com/nodejs/bluesky" \
  -F prTitle='Retweet vx.x.x release announcement' -F postURL=… \
  -F richText=…

[bmuenzenmeyer]

Tested over at https://github.com/bmuenzenmeyer/bluesky/pull/1/files - compared to the common use case - retweet json. output is identical to recent retweet at https://github.com/nodejs/bluesky/pull/34/files

overall, this is SUPER COOL.

I can see this being integrated into other actions and release automation.

With the advent of more automation, I'd love to add a bit more scrutiny to the repo., such as scorecard. This can be follow up of course.

[joyeecheung]

So I am not sure if this was the checkbox I clicked...(I wasn't looking at the screen super carefully when I clicked save)

The audit log says this, which looks about right: