feat: add 'draftRelease' option

[BetaHuhn]

Summary

This PR adds a new draftRelease option which, when set to true, will create a GitHub draft release instead of publishing an actual GitHub Release. The option defaults to false and will thus not impact current users.

Fixes #275

[BetaHuhn]

Any plans to merge/review this?

Friendly ping, @gr2m

[gr2m]

Yes, as soon as we find the time to review it, I cannot tell when that will be right now, sorry

[BetaHuhn]

No problem!

[alex-dixon]

Maybe until there's time to review it it could be published on a draft release channel? 😄

Some of us could give feedback, add fixes if needed, etc.

[jimCresswell]

This would be useful for us too. Happy to help if that's possible.

[tubbo]

This would also be useful to us. We'd like to use semantic-release as a means of releasing our Electron application, and because we need to wait for multiple parallel workflows to complete before we can mark it as released, we currently have a bit of a rube goldberg machine set up to handle use cases like multiple release channels. It would be a lot better if we could use semantic-release instead of combining multiple other tools together to get basically the same result.

I'd also be happy to help test and review code if that's needed. This is pretty much exactly like the implementation I have locally.

[MrSquaare]

I am also interested in this option. I have a case where I have several assets that need to be built on different operating systems. I can't have them available at release time and associate them with @semantic-releas/github. A draft option would allow me to proceed in several steps.

[gr2m]

Thank you all for your patience, for sharing your use cases and for your offers to help. I know it has been a long time coming. I finally got around to review it and it all looks good. I'll merge and release it shortly

[github-actions[bot]]

:tada: This PR is included in version 8.1.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket:

[github-actions[bot]]

:tada: This PR is included in version 9.0.0-beta.2 :tada:

The release is available on:

• npm package (@beta dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: