Add a wrapper .ci/wiki.sh, that pmbootstrap ci can run and use it in
gitlab-ci.yml. Add a .ci/lib/gitlab_prepare_ci.sh script that makes a
user available with sudo, as expected by the pmbootstrap ci compatible
scripts. Set up binfmt_misc too while at it, it will be needed for
running pmbootstrap.
The next patches will adjust the rest of the CI scripts and move the old
scripts in the .ci/lib dir, so only the scripts that should be called
directly are in the .ci dir.
Related: https://postmarketos.org/pmb-ci
Copy all test cases from the pmbootstrap repository, that are actually
testing the aports. They were all adjusted to work nicely in this
repository, together with a brand new set of gitlab-ci configs.
This also includes the changes from this merge request, that had a
better detection of changed packages:
<https://gitlab.com/postmarketOS/pmbootstrap/merge_requests/1621>
