CI: Use Fedora 35 container (Linux only)

CI: Use Fedora 35 container (Linux only)

Run all Linux based jobs in a container, using a custom Fedora 35 image
(gcc 11).  The image URL specified in the defaults.yml template, so that
all CI jobs can use it. The image is hosted on ghcr.io and the
Dockerfiles are here: https://github.com/tianocore/containers The
version numbers of gcc, iasl, and nasm are pinned to avoid unintended
upgrades during image rebuild.

Do not run apt-get in CI jobs to install qemu and gcc dependencies.
Assume the container image provides these.

Use Python from the container image, do not download at runtime.

Signed-off-by: Oliver Steffen <osteffen@redhat.com>
Reviewed-by: Michael Kubacki <michael.kubacki@microsoft.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Chris Fernald <chfernal@microsoft.com>