To avoid proliferation of versions, I suggest the following policy: the
oldest LTS release still receiving maintenance updates + the most recent
release for distributions that offer LTS releases.
For CentOS, this means CentOS7 and CentOS Stream 9 (since CentOS are all
"long-term support", this is just the oldest and the newest among
currently supported).
For Ubuntu, this means Ubuntu 18.04 (previous LTS are in "security fixes
only" mode) and Ubuntu 21.10. Recent Ubuntu attempts to be interactive
during the configuration of tzdata, required some additional setup.
In the common installation script, the logic for handling a
configured/built local directory breaks if `gmake` is detected as the
make binary; `make distclean` then fails inside the container because
not all systems have `gmake` symlink. Remove that attempt of a
workaround completely, just require that the host directory is clean.
Signed-off-by: Alexey Neyman <stilor@att.net>
