Add shellcheck support (config, workflow to detect/not fix) and address some warnings #2584
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More about shellcheck https://www.shellcheck.net/ .
CI workflow has 'permissions' set only to 'read' so also should be safe.
Individual commits should have more of description. One of the "largest" changes is explicit specification to use
bash
instead of some generic POSIX shell due to use ofecho -e
which according to shellcheck is not guaranteed to be supported by a POSIX shell... e.g. indash
:TODOs