chore: Prepare for development

[ignaciogoldchluk-yolo]

• Github Actions workflow to test the package
• Add .tool-versions
• Fix warnings on newest Elixir
• Delete old Docker/compose and Travis config files
• Delete coveralls (we can add back again it later)
• Add script to fetch deps + start server + test
• Remove unused library :httpoison
• Remove uuid and vendor Ecto.UUID.generate/0 instead
• Replace mock with mox, or delete if the dependency is not required
• Remove mix_test_watch
• Bump ex_doc
• Bump stream_data
• Replace poison with jason
• Add Github Actions "release" workflow.
  • Not entirely sure about this one because the name gremlex is already taken. We would have to create a new package, or if we do not plan on publishing it then we will always have to reference via git
• Update README.md
• Fix flaky tests

There is only one caveat/issue. :socket library is unmaintained, and it throws type errors. The library could be replaced by https://github.com/elixir-mint/mint_web_socket but it might require some additional refactoring.

[yolo-vikram]

Maybe remove confex and use System or Application module?

[ignaciogoldchluk-yolo]

I believe that would be a breaking change? confex is for users to set variables as {:system, "GREMLEX_HOST", "127.0.0.1"} instead of System.get_env("GREMLEX_HOST", "127.0.0.1"). The thing is confex supports also file config, casting to integer, atom, etc.

[yolo-vikram]

Suggested change

	- 8182:8182
	- 8183:8182

different internal - external port

[ignaciogoldchluk-yolo]

That is usually done for reserved/assigned ports. In the case of port 8182 it is not assigned. If it ever conflicts with someone's local setup we can set this as an env var like

ports:
  - ${GREMLEX_SERVER_PORT}:8182

and use an .env file like

GREMLEX_SERVER_PORT=8182

[yolo-vikram]

LGTM 🚀