Fixing test script to return 0 on success

Leaning away from committing package.json

Thank you yutachaos!

Merge pull request tests-always-included#45 from yutachaos/feature/ad…

…ded_docker_release

Added dockerfile and release GitHub Action

Updating test and documentation

Adding tests, shellcheck cleanup, update docs, release 2.2.0

Merge pull request tests-always-included#32 from andreax79/master

Pass arguments to function as environment variable MO_ALLOW_FUNCTION_ARGUMENTS

Adding a version number

It is shown with --help. It's also available as $MO_VERSION when mo is
sourced.

Found another issue with strict mode

More fixes if variables are not set and strict mode is enabled

Fix for when running in strict mode