Add Winget Releaser workflow

[sitiom]

This action automatically generates manifests for the Winget Community Repository (microsoft/winget-pkgs).

• Related to Add to package managers in Windows #57

Before merging this:

1. Add a PAT with public_repo scope as a repository secret named WINGET_TOKEN.

2. Fork https://github.com/microsoft/winget-pkgs under @localsend. The action will use that fork for making a branch and creating a PR with the upstream winget-pkgs repository on every release.
3. Install Pull on the winget-pkgs fork to ensure that it is constantly updated.

Important: The MSIX file has to be available when you make a release for the workflow to detect it.

The documentation and source code of the action is available here.

If you want to see an example of a PR created using this action, see microsoft/winget-pkgs/pulls (Pull request has been automatically created using 🛫 WinGet Releaser).

[Tienisto]

Thanks for the nice tutorial. I have created a token with access to public repos. After finish, it looks like this:

I also forked this repo and installed the app. Is this all. Do I need to configure in the repo settings something?

[Tienisto]

I also added this to the repository secrets:

[sitiom]

Yeah, I think you did it right. Make sure WINGET_TOKEN is in this repo and not in the fork.