Allow forcing local build with environment variables

[wmertens]

I'm using pnpm in my project and sqlite3 is a dep-of-dep. I want it to use a give sqlite3 binary and it seems that the only way to do that is to go into the module after install and manually run npx node-pre-gyp install --build-from-source

It would be great if there was a way to force build during install e.g. NODE_PRE_GYP_BUILD=sqlite3,bcrypt.