This commit relaxes the "mirror" schema regex from only allow
hashes to the repo ID regex as described in
https://dnf.readthedocs.io/en/latest/conf_ref.html#description
This is needed because in e.g. bootc-image-builder we use
"SetRootDir()" to get the repository information from an existing
bootc image and there the repo_id (that is then used as the mirror_id)
is written in a human friendly way instead of hex.
Thanks to Tomáš Hozza for the suggestions and background info, see
https://github.com/osbuild/osbuild/pull/1974#issuecomment-2579325272
This commit adds support for the `org.osbuild.mtls` sources and
adds a test.
Note that it reuses the `OSBUILD_SOURCES_CURL_` - this may or
may not be desired, it is certainly simpler this way and librepo
is using libcurl as well internally but it feels a bit messy so
maybe we want to rename the env?
This commit adds unit a basic test for librepo and also updates
the code to the latest requirements to provide "fetch_all".
It also fixes a bug in the handling of org.osbuild.rhsm secrets.
