Added FHS compliant Nix devshell to test install to /usr/local/bin

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1753345091,
+        "narHash": "sha256-CdX2Rtvp5I8HGu9swBmYuq+ILwRxpXdJwlpg8jvN4tU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "3ff0e34b1383648053bba8ed03f201d3466f90c9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-25.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,25 @@
+# NOTE: this devshell exists because I'm scared of my
+{
+  description = "FHS compliant devshell for Billie Hilton's g CLI";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+  }: let
+    system = "x86_64-linux";
+    pkgs = nixpkgs.legacyPackages.${system};
+    fhs = pkgs.buildFHSEnv {
+      name = "g-fhs-shell";
+      targetPkgs = pkgs:
+        with pkgs; [
+          shellcheck
+        ];
+    };
+  in {
+    devShells.${system}.default = fhs.env;
+  };
+}