Workflow for publishing spin:up WIT package

[fibonacci1729]

Simple manual dispatch workflow for publishing the spin:up WIT package.

Draft for now until I amend the release notes.

Will follow up with separate PR amending the release notes once the first release is done.

[itowlson]

Basically LGTM but wanted to double-check one thing (the other is a mere nit)

[itowlson]

Oh the other thing I couldn't remember from my previous testing (and now can't verify because nothing ever works) was if wkg packages arrived public or private. GHCR tends to default to private and I can't remember if wkg fixes that.

[fibonacci1729]

@itowlson good question; i'm not sure. I think it's something we can investigate once this lands and we try to publish the first package. cc/ @lann if you have thoughts on this.

[lann]

wkg just speaks generic OCI; it doesn't know anything about GitHub. If ghcr.io packages default to private then that's what will happen.

Edit: but I believe you only have to change the visibility for a package once.