shell script CI checks
This adds syntax checkers for all the shell scripts using bash, dash, and checkbashisms, based on availability. It also adds them to the git pre-commit hook, so they can run as people are committing.
This adds syntax checkers for all the shell scripts using bash, dash, and checkbashisms, based on availability. It also adds them to the git pre-commit hook, so they can run as people are committing.