Replace the `figaro` gem to `dotenv-rails` gem about rails-templates HOT 4 CLOSED

I prefer the docker-compose way and removing both gems altogether.
Just my 2 cents anyway.

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@MidnightWonderer we could use that when we deploy docker containers, which we dont yet.

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@anduonghien way back, we used to rely on dotenv but moved to Figaro as it has better support for Heroku + we can group/share variables for all environment in a single file vs multiple files with dotenv (.env.development, .env.test).

As for sharing env variables between Ruby and JS, it's not a critical issue in our current setup as we usually have a JS to a front-end client (not a Node.JS app) which is not sharing much dependency with the Ruby backend.

But if we find it's something we would like to have to be future-proof then I don't see any issue to switch back

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Closed in favor of #394 (sorry for that duplicate 🙈 )

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