[feature] Add support for custom server path via env or cli

[jenia90]

Changelog: Feature: Added support for using server config from a custom location, setting CONAN_SERVER_HOME env variable or using -d or --server_dir flag when launching the server with conan_server command.
Docs: conan-io/docs#2125

When launching from the command line the new CLI flag will be prioritized over the environment variable, this is because we want to let the user test the server with custom dirs even if an env var has been set.
I've also added some tests to test the new feature (even though currently the tests are pretty basic).

Close #9098.

Please let me know if there are any improvements to be made :)

[CLAassistant]

All committers have signed the CLA.

[memsharded]

Looks good!

[czoido]

I think I would prefer to have the server folder stored under the serve_folder/.conan_server insted of directly in server_dir to be more symmetric with the conan client, but that's just a personal opinion... so I would be ok with that.

[jenia90]

Hi @czoido
Thanks for the feedback, I'm resolving the issues that came up, so hopefully I will have a fix in a bit.
Regarding the folder location, initially I considered placing .conan_server folder inside the custom path, but then I thought that it would give the user more flexibility when choosing where to store their configs and data. If you or your team think it's better to place it under .conan_server inside the custom path, I'll happily make the relevant changes :)

[memsharded]

I think I would prefer to have the server folder stored under the serve_folder/.conan_server insted of directly in server_dir to be more symmetric with the conan client, but that's just a personal opinion... so I would be ok with that.

Actually, this is something that will change in Conan 2.0, and the client side will be able to define directly the cache folder, without the extra .conan folder. So I am fine with it the way it is.

[memsharded]

Thanks for contributing this. If possible, it would be nice to do a PR to the docs repo to update the docs with this new feature. I think adding a couple of lines will be good enough. Then, update the TODO in the first comment, we automatically generate the changelog from there.

[jenia90]

Thanks for contributing this. If possible, it would be nice to do a PR to the docs repo to update the docs with this new feature. I think adding a couple of lines will be good enough. Then, update the TODO in the first comment, we automatically generate the changelog from there.

@memsharded, thank you for accepting my PR! To update the docs I need to create a new issue on the docs repo and then submit a PR, correct?

[memsharded]

@memsharded, thank you for accepting my PR! To update the docs I need to create a new issue on the docs repo and then submit a PR, correct?

No need for the issue, this issue or PR is good enough for it, go directly for the PR.