This commit configures the CI to run specific parts of the CI when
relevant changes has been made.
This should help us not have to deal with the integration tests when we
do doc/admin changes.
This commit splits the lint and test steps into two different jobs in
github actions.
Consider this a suggestion, the idea is that when we look at PRs we will
see explicitly which one of the two types of checks fails without having
to open Github actions.
