workflow: add a github action to auto build plugins.json

[begoat]

Developers make pr changing their own package directory, but usually they don't run script.

Can we introduce Github action to refine this workflow? Because any changes to the package director will not work until the script get executed.

[sawhney17]

Check out the dev template by @pengx17. It integrates the semantic versioning bot which may be what you're after.

https://github.com/pengx17/logseq-plugin-template-react

[begoat]

Thanks @sawhney17 . Let me clarify a little bit. Sorry for my previous desc.

Imagine i am a plugin developer I need make a PR in this repo adding my manifest.json and icon.png to this repo.

After the PR got merged. We also need a commit like 03d0e47 to update plugins.json and stats.json. I think This process can be done by github action? this will be helpful to leverage the workload of maintainer of this repo.

[Bad3r]

@begoat good idea; would you be able to submit a PR?