expose git to button, fixes error executing 'git': No such file or directory

panel/env.nix

@@ -9,5 +9,10 @@ in
 {
   REPO_DIR = toString ../.;
   # explicitly use nix, as e.g. lix does not have configurable-impure-env
-  NIX_BIN = lib.getExe pkgs.nix;
+  BIN_PATH = lib.makeBinPath [
+    # explicitly use nix, as e.g. lix does not have configurable-impure-env
+    pkgs.nix
+    # nixops error maybe due to our flake git hook: executing 'git': No such file or directory
+    pkgs.git
+  ];
 }

panel/src/panel/settings.py

@@ -192,8 +192,8 @@ if user_settings_file is not None:
 #     The correct thing to do here would be using a helper function such as with `get_secret()` that will catch the exception and explain what's wrong and where to put the right values.
 #     Replacing the `USER_SETTINGS_FILE` mechanism following the comment there would probably be a good thing.
 
-# a dir of nix supporting experimental feature `configurable-impure-env`.
-nix_bin=env['NIX_BIN']
+# PATH to expose to launch button
+bin_path=env['BIN_PATH']
 # path of the root flake to trigger nixops from, see #94.
 # to deploy this should be specified, for dev just use a relative path.
 repo_dir = env["REPO_DIR"]

panel/src/panel/views.py

@@ -58,11 +58,12 @@ class ConfigurationForm(LoginRequiredMixin, FormView):
             # serialize back and forth now we still need to manually inject the dummy user
             deployment = json.dumps(dummy_user | json.loads(submission))
             env = {
+                "PATH": settings.bin_path,
                 # pass in form info to our deployment
                 "DEPLOYMENT": deployment,
             }
             cmd = [
-                settings.nix_bin,
+                "nix",
                 "develop",
                 # workaround to pass in info to nixops4 thru env vars, tho impure :(
                 "--extra-experimental-features",