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Move ICAT+ server URL to environment variable

Merged Axel Bocciarelli requested to merge env into master

The first step to move some of the most environment-specific configuration options to environment variables.

Like in ICAT+, moving to environment variables for some options (not all) has many advantages:

  • Each environment can have its own configuration (until now, icatPlus.example.js was the production configuration).
  • Default values for every environment (dev/test/prod) appear directly in the version-controlled source code, which is good for discoverability and for developer induction (i.e. new devs have a set-up that works out of the box).
  • Default environment values can easily be overridden in .env.*local files without impacting other developers, since these files are not overriden.
  • A developer's configuration doesn't get overridden when running npm run build, so it is now easier to build the app with development variables for testing purposes.