There are a number of updates we make for Ubuntu Noble in this commit.
1. Remove python2-dev from bindep for Noble as Noble appears to have no
python2 runtime options.
2. Add libjpeg-dev to bindep for noble because Pillow doesn't build
python3.12 wheels for Pillow<10 which we currently depend on. This
means we need to build from source and that depends on libjpeg-dev.
3. We remove double bracket wrappers from ansible vars in ansible
assertion blocks. Having them results in errors like:
Conditional is marked as unsafe, and cannot be evaluated.
4. We update rust testing to explicitly install pkg-config before
building python cryptography. This tool is required to build
cryptography from source and is no longer being pulled in either
by the base images or build-essential meta pacakge.
5. Add an Ubuntu-24.04 tasks file for the ensure-skopeo roles so that
we try to install skopeo using distro packages or build from source
and don't use Kubic which only has packages for old Ubuntu releases.
Change-Id: I388710ce40dc757ada4de819a9c3c59fc32fb07a
298354d2e3