Support install scripts

[jyecusch]

Cloning templates, like the JavaScript template, then using nitric run or nitric up result in errors since no package.lock or yarn.lock exists. Extending nitric.yaml to support commands that enable scripts to be run prior to a build could fix this issue for new users.

[jyecusch]

How does Vercel handle this for sample project cloning? Do they contain a lock file, does the Vercel platform add one?

[tjholm]

I think the solution provided here is too broad for the specific issue. We do need more customisation and extensibility, but I would rescope this issue to specifically handling how we deal with *.lock files for node projects.

[asalkeld]

can we not add this logic into the typescript runtime?

[tjholm]

Supported with custom dockerfile support