Docker/oci and thus gitlab-runner, default to a root
user inside the namespace, even if its an unprivileged
one.
This can cause issues and let permission bugs sneak in,
as we are functionally root when running the build.
Switch the build jobs to run with our new "containeruser"
so we avoid much of it.
Our user is still in the wheel/sudo group but that's fine
as long we don't elevate the privileges unintentionally.
Noticeably for the time being, we will need to chown the
CI_PROJECT_DIR checkout as the gitlab runner might try
to reuse pre-existing and cached volumes of the project
checkout.
Additionally we need to change the ccache path, so we
will avoid the existing cache owned by "root".
Close https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/2433
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8763>
Now that we have the monorepo, we always have a checkout
of gstreamer and we don't need to explicitly clone it again.
cbuild in ci-templates will always clone the repository in
/tmp/clone and we can use that to initialize the cache.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8994>
Devcontainer [1] is a popular container schema that makes
IDEs and tooling aware about the container image you want
to use and develop against.
The most popular implementation of devcontainer are Visual
Studio and VSCode and this allows us to have a out of the
box pre-defined and working build environment that is very
close to the environment CI runs against.
This also allows VSCode on Windows and Mac to setup a
Linux docker container (vm) to develop against if so
desired.
[1] https://containers.dev/
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7816>
The gstreamer-rs repos use debian based images already,
which we can later base on this one. Additionally it's
good to have another distro target so we avoid weird
fedoraisms when possible.
It will also be simpler to keep it up to date, as we
don't need to run the test suite against this build as
well.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6656>
