cli: get optional deps from our own flake

This ensures we actually test if all those binaries build

pkgs/clan-cli/clan_cli/nix.py

@@ -2,9 +2,9 @@ import os
 
 
 def nix_shell(packages: list[str], cmd: list[str]) -> list[str]:
-    nixpkgs = os.environ.get("CLAN_NIXPKGS")
+    flake = os.environ.get("CLAN_FLAKE")
     # in unittest we will have all binaries provided
-    if nixpkgs is None:
+    if flake is None:
         return cmd
-    wrapped_packages = [f"path:{nixpkgs}#{p}" for p in packages]
+    wrapped_packages = [f"path:{flake}#{p}" for p in packages]
     return ["nix", "shell"] + wrapped_packages + ["-c"] + cmd

pkgs/clan-cli/clan_cli/zerotier/__init__.py

@@ -86,8 +86,9 @@ class ZerotierController:
 def zerotier_controller() -> Iterator[ZerotierController]:
     # This check could be racy but it's unlikely in practice
     controller_port = find_free_port(range(10000, 65535))
+    cmd = nix_shell(["bash", "zerotierone"], ["bash", "-c", "command -v zerotier-one"])
     res = subprocess.run(
-        nix_shell(["bash", "zerotierone"], ["bash", "-c", "command -v zerotier-one"]),
+        cmd,
         check=True,
         text=True,
         stdout=subprocess.PIPE,