node-pre-gyp not found

[gripp]

What version of this package are you using?
v4.1.1

What operating system, Node.js, and npm version?
Mac OS X v11.4 / node v15.9.0 / npm v7.19.0

What happened?
I cloned the repo from head and ran docker build on the Dockerfile. The build broke on line 8, complaining that node-pre-gyp was not found.

What did you expect to happen?
I expected it to build completely.

Are you willing to submit a pull request to fix this bug?
Yup. I fixed it by adding a line to the Dockerfile to install node-gyp and node-pre-gyp.