Support custom install and build commands

[timrbula]

Is your request related to a problem? Please describe.

I would like to run pnpm install --production and pnpm build:styles in my build process

Describe the solution you'd like

I would like to be able to specify custom commands to be run for installing dependencies and building the application e.g. build.install.script and build.script

Describe the benefits or justification for this request

I won't have to fallback to using Docker for building w/ custom commands

Additional context
Add any other context or screenshots about the feature request here.

[timrbula]

Build script has been completed w/ #50

[timrbula]

@gchickma Would be good to do install script as well one day. You can configured basically everything via a project .npmrc file, but I don't think most teams know that.

That being said if your app needs specific install flags (there are ones that are commonly used to ignore peer dependency issues, among others) then they should probably have that defined so devs don't need to know the magic combination to get the app to run locally. So that would be an opportunity to do some best practices education, but we should probably still provide the functionality via a property.

[gchickma]

@timrbula Sounds good. Lets look at that when we both have some time to work thru it.