[Chapel Merge] Add nightly gcc 11.2 testing

Branch: refs/heads/main
Revision: d71959f
Author: ronawho
Log Message:

Merge pull request #18180 from ronawho/gcc-11-nightly-testing

Add nightly gcc 11.2 testing

We had a couple of warnings with gcc 11 that are fixed in #18178. Add
nightly testing to lock in the fix and catch any future issues.

Modified Files:
A util/cron/test-linux64-gcc112.bash

Compare: https://github.com/chapel-lang/chapel/compare/3cac4326bc86...d71959f33f7a