[nxc init] now can also use the nix flake templates

Add some cli args to use the templates instead of copying the folders in /examples:

nxc init -t [template]
# or
nxc init --template [template]

ex:

nxc init -t webserver

there is also a flag to either fetch the template locally. by default we fetch the template from the flake on master on gitlab.

to use the local templates:

nxc init -t websever --use-local-templates

requested review from @orichard

added 1 commit

• 0f14b1c7 - [nxc init] list available templates

Compare with previous version

can now also list the available templates:

$ nxc init --list-templates-json --use-local-templates
{
    "basic": "Minimal example",
    "basic-flake-only": "Basic example with nix dir via flake",
    "basic-nur": "Basic example using a NUR",
    "kernel": "Example with different Linux Kernels",
    "multi-composistions": "A multi-compositions example",
    "spark": "Spark example",
    "webserver": "A nginx example"
}

I added a derivation able to generate a json file with the information about the templates. the nxc init command calls nix build to get the json file. this allows us to be able to fetch the templates on the git and also locally

actually there might be some issues with the fetching of the git's templates. maybe templates of the git will differ in version compared to the local install of nxc the best thing would be in actually install the flake locally and then call it

nix registry add nxc git+https://gitlab.inria.fr/nixos-compose/nixos-compose

merged

mentioned in commit 8244c07c