Improve CI

[niklas-heer]

It should only run if something is changed in the relevant files (src/*, Earthfile, ...) not if documentation or assets are updated.

[Akaame]

on:
  push:
    paths-ignore:
      - 'assets'
      - 'README.md'
      - 'LICENSE'
      - '.gitignore'
    branches:
      - master
      - next
  pull_request_review:
    types: [submitted]
  pull_request:
    types:
      - labeled

Should do it, I suppose. What else would you add to the list of ignored paths?

[niklas-heer]

@Akaame that is a great help! Thank you so much. I think you covered everything.