CI: switch Dockerfiles back to Ubuntu 22.04 LTS #3615
Merged
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z3.4.8.5-1 can no longer be installed on Ubuntu 24.04 because python3-distutils disappeared, and the z3 opam package has not been fixed for version 4.8.5, and 23.10 and all prior non-LTS are now EOL. So, this PR reverts the Dockerfiles
to the previous Ubuntu LTS, i.e. 22.04
Commit 8d8149f should be reverted once a new opam package for z3 4.8.5 appears, or we upgrade to a new z3 (see #2974)