ci: setup manual release workflow

[marcus-sa]

Summary of changes

Needs an NPM_TOKEN secret https://docs.npmjs.com/creating-and-viewing-access-tokens#creating-legacy-tokens-on-the-website https://docs.github.com/en/actions/security-guides/using-secrets-in-github-actions#creating-secrets-for-a-repository

How to use https://github.blog/changelog/2020-07-06-github-actions-manual-triggers-with-workflow_dispatch/

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