Tighten apt install regex when no exact package match is found

[rjaegers]

Apparently when no exact package match is found, apt-get install (or apt install) can revert to regex matching of packages. This introduces the risk that additional unnecessary packages might be installed.

This behavior was seen in PR #294 when the non-existing g++-13 package was supposed to be added, but some clang-13 packages were installed instead.

See also this stack exchange post.

[github-actions]

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