Debug vs prod configuration support

[nkrusch]

Describe the solution you'd like
Enable way to setup project config files that can be easily changed between dev and prod builds, for example, to switch out API endpoints.

[nkrusch]

Node env variables should be able to handle this. CRA implements a way to inject env variables this way both in js and in HTML files and it requires a specific prefix ref, which are then replaced at build time. Similar approach could work here. It would also need to be documented in user guide.

[Gentatsu]

+1 on this. Would be great to deal with it like that at build time to be passed in.