This makes linters not complain about unused modules.

The `@python_versions//3.11:defs.bzl` has been deprecated since version
1.1.0.

We don't run the Docker tests in CI, they're only there for reference,
so `examples/` is a better place for it.

`ctx.label.repo_name` is empty in some situations, so we need to use an
external label instead.

Introduced in 7633740e.

Refs: 978c3940.

The test suites also changed so that we can run tests for different CPUs
easily.

CI also needs to change as we only run QEMU tests in some occasions.

The `apt` extension can install Debian packages. This reduces
significantly passed `srcs` to `debian_patchelf` rules as also
hugely reduces the maintenance.

`runfiles.Rlocation(path)` can sometimes return `None`, so we need to
handle that case in addition to checking if the path exists.

The dependency on `rules_diff` was causing an error when trying to
consume the public targets externally.

Related to #34.

Otherwise, `qemu` runs regardless of whether the `.pre` stage completes
succesfully, causing a waste of CI resources.

No change in behaviour, just better naming.

It's more flexible to use eligible approvers[1]:

[1]: https://gitlab.arm.com/help/user/project/merge_requests/approvals/rules#eligible-approvers

Using roles is currently supported behind a feature flag[1].

[1]: https://docs.gitlab.com/ee/user/project/codeowners/reference.html#add-a-role-as-a-code-owner

This gives users with at least a Developer role approval rights, except
for when there's a more specific rule listed explicitly.

This makes CODEOWNERS more about code quality and less about
gatekeeping.