Add shell specific launch execution

[florianb]

This aims to solve #981.

I

• moved the shell specific opts handling into dedicated exec.* scripts.
• added a Dockerfile make it easier testing different shells (i would be able to add VSCode devcontainer support if possible).
• added a dev docs section.

[lukaszsamson]

Nice. I wonder if we could add CI tests based on that dockerfile.

i would be able to add VSCode devcontainer support if possible

Not sure if I understand that. VSCode devcontainers already work with https://github.com/elixir-lsp/vscode-elixir-ls

[florianb]

Nice. I wonder if we could add CI tests based on that dockerfile.

I thought about that, too - and i guess i would have done it but i couldn't manage to run the language_server.sh using fish. But yeah, i guess it is possible to have an automated test for it.

Where would you like to have that test, in a /test-directory?

Not sure if I understand that. VSCode devcontainers already work with https://github.com/elixir-lsp/vscode-elixir-ls

Yeah - sorry - i meant i could add a devcontainer setup for this project (i experimented a lot with devcontainers in the recent two years) which would allow an developer to onboard just having docker desktop and VSCode but comes at the cost of one additional directory (.devcontainer) in the project.