Add only: changes: globs for nested package.json and package-lock.json files (I think this should work?)

Hmm, this image defaults to user nobody, which can't do a few things.  Can we user root, run apt and npm i, then user nobody?

Glob any package.json / package-lock.json (sometimes these are buried in a project dir structure as parts of "sub-projects", etc.)

Per last commit, python3-dev didn't help, so just installing wheel package explicitly under virtualenv

Install python3-dev via apt so as to hopefully avoid "Failed building wheel for pyyaml" initial install.  pyyaml does install fine, eventually, but I'd like to get rid of this error if possible.

Fix multi-line script commands to use multiline block scalar indicator per https://gitlab.wikimedia.org/help/ci/yaml/script.md#split-long-commands