Add Universal Action and keyboard shortcuts as triggers

[muffix]

I added hotkeys and an universal action as input triggers for this workflow in my personal setup. I'd like to contribute it back, but the workflow's info.plist is not part of this repo. I'd like to add it to the repo and update it.

This would also allow automating the release process with a GitHub action.

Happy to submit PRs for both.

[muffix]

Added PRs for both, while the latter depends on the former. Would you mind having a look @dennis-tra?

[dennis-tra]

Thanks so much @muffix! Just a heads up, I'm currently travelling and will only have time to check back with the PRs end of next week :/