add flake support

TODO.md

@@ -1,4 +1,4 @@
 # TODO:
 
-- add flake
+- publish to gitea repo: [container](https://docs.gitea.io/en-us/usage/packages/container/)  [badge](https://docs.gitea.io/en-us/usage/packages/generic/)
 - use bool value for `generate_gitea_project` when the feature is available

{{ cookiecutter.project_slug }}/.woodpecker.yml

@@ -1,5 +1,6 @@
 pipeline:
   test:
+    group: test
     image: python:${PYTHON_VERSION}
     pull: true
     environment:
@@ -9,6 +10,17 @@ pipeline:
       - poetry install
       - poetry run pytest
 
+  nix:
+    group: test
+    image: nixos/nix:latest
+    pull: true
+    commands:
+      - nix build --experimental-features 'nix-command flakes'
+      - nix build --experimental-features 'nix-command flakes' .#docker
+    when:
+      matrix:
+        PYTHON_VERSION: {{ cookiecutter. python_min_version}} # Still not sure about how to make flake for different python version
+
 matrix:
   PYTHON_VERSION:
     - {{ cookiecutter. python_min_version}}

{{ cookiecutter.project_slug }}/README.md

@@ -1,19 +1,42 @@
 {% set is_open_source = cookiecutter.open_source_license != 'Proprietary' -%}
 {% set repo = "/".join(cookiecutter.git_origin.removesuffix(".git").split(":")[-1].split("/")[-2:]) %}
 # {{ cookiecutter.project_name }}
-{% if cookiecutter.configure_ci %}[![CI status badge]({{ cookiecutter.woodpecker_server }}/api/badges/{{ repo }}/status.svg)](https://ci.pains-perdus.fr/histausse/test_ci_template){% endif %}
+{% if cookiecutter.configure_ci == "True" %}[![CI status badge]({{ cookiecutter.woodpecker_server }}/api/badges/{{ repo }}/status.svg)](https://ci.pains-perdus.fr/histausse/test_ci_template){% endif %}
 
 
 {{ cookiecutter.project_short_description }}
 
 ## Install
 
+
+### With pip
+
 This project can be installed using pip:
 
 ```
 pip install git+{{ cookiecutter.project_url }}.git
 ```
 
+### With Nix
+
+There is a `flake.nix`, so you can clone the repo and use `nix shell` if you want.
+
+### Docker/Podman
+
+You can build a container image using nix. To build the image, in the repo, run:
+
+```
+nix build -o {{ cookiecutter.project_slug }}.img .#docker
+```
+
+You can then load the image with:
+
+```
+podman load < {{ cookiecutter.project_slug }}.img
+```
+
+(If you want to use the image, notice it uses nix and is very minimal).
+
 {% if is_open_source %}
 ## License
 

{{ cookiecutter.project_slug }}/flake.nix

@@ -0,0 +1,36 @@
+{
+  description = "{{ cookiecutter.project_short_description }}";
+
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  inputs.poetry2nix = {
+    url = "github:nix-community/poetry2nix";
+    inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, poetry2nix }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        inherit (poetry2nix.legacyPackages.${system}) mkPoetryApplication;
+        pkgs = nixpkgs.legacyPackages.${system};
+      in
+      {
+        packages = {
+          {{ cookiecutter.project_slug }} = mkPoetryApplication { projectDir = self; };
+          docker = pkgs.dockerTools.buildImage {
+            name = "{{ cookiecutter.project_slug }}";
+            tag = "latest";
+            copyToRoot = pkgs.buildEnv {
+              name = "{{ cookiecutter.project_slug }}_root_img";
+              paths = [ self.packages.${system}.{{ cookiecutter.project_slug }} ];
+              pathsToLink = [ "/bin" ];
+            };
+          };
+          default = self.packages.${system}.{{ cookiecutter.project_slug }};
+        };
+
+        devShells.default = pkgs.mkShell {
+          packages = [ poetry2nix.packages.${system}.poetry ];
+        };
+      });
+}