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What type of PR is this? (check all applicable)
Description
This replaces travis CI with GitHub Actions. As I mentioned in #2278, we can't really use travis anymore because we ran out of credits. I have contacted the travis team, but I have not yet heard back 5 days later.
I decided to not use docker, even though it would make it easier to move CI to another provider, should we ever need/want to.
I think the overhead of having our own docker image is too high and if we just used for example the official ubuntu image, build times would be extremely high because we would need to install a bunch of packages everytime.
This also fixes some compilation issues that surfaced.
Related Issues & Documents
Closes #2278
Documentation (check all applicable)