Add save svg-badge directly to gist

[runarberg]

This adds the posibility of saving an SVG badge generated by the same shields.io dirictly to the gist. Instead of prepering a JSON file to be sent to their service, we use their library directly, which outputs an SVG file that we can save to the user’s gist.

Filenames ending in .svg will use this library automatically.

Additionally there is a major refactoring where the older node:http library has been swapped out for fetch.

Also swap from node 16 to node 20

fixes #24

[Schneegans]

Thanks a lot! This looks pretty good. I'll merge this into a temporary branch and do some thorough tests. Adding some decent CI tests would be a future task, I guess 👀

If everything works as supposed, I'll write some documentation for this new feature and then merge it to master!

Thank you very much!

[LucBerge]

What is the point of commiting node_modules/ ?

Thanks a lot! This looks pretty good. I'll merge this into a temporary branch and do some thorough tests. Adding some decent CI tests would be a future task, I guess 👀

I agree, would be nice to have a test workflow for future PRs to make sure nothing breaks.

[runarberg]

The github actions doc specify requests you commit node_modules:

From your terminal, commit your action.yml, index.js, node_modules, package.json, package-lock.json, and README.md files. If you added a .gitignore file that lists node_modules, you'll need to remove that line to commit the node_modules directory.

https://docs.github.com/en/actions/creating-actions/creating-a-javascript-action#commit-tag-and-push-your-action-to-github

I think there is a way to compile the node_modules directory into a single file with @versel/ncc however I think that is out of scope (and it certainly was for me 😉)