ci: add a publish workflow

[abn]

If this does not match the release wofklow today, please feel free to close. The workflow expects the following release flow.

1. A new version is tagged using pnpm version command.
2. The new tag (v<version>) and default branch is pushed to remote.
3. The workflow creates a new release on GitHub associated with the tag.
4. The workflow builds the package for publishing.
5. The workflow publishes package to npmjs.

The workflow requires the NPM_TOKEN action secret to be set to a valid token.

[mattdavis90]

NPM_TOKEN already exists for the action and there's a pnpm build just before publish so I'm pretty happy this is good to go. I'll merge it now, cut a new release and see how we get on. Thank

[mattdavis90]

One tweak required but the workflow is working and v0.17.0 is released with your changes in it!

Thank you so much for all the PRs, the tidying up, the workflows, etc. This is awesome!! 🚀

[abn]

It is odd pnpm publish does not understand the tag. /shrug

Thanks for merging and fixing, and thank you for the library - it has been very useful for me. Happy to help where I can. 😄

[mattdavis90]

Yes, very strange

No problem, I'm glad it is helpful to people.