Add a simple devshell

flake.nix

@@ -308,5 +308,25 @@
         ];
       };
 
+      devShell.x86_64-linux =
+        let pkgs = import nixpkgs { system = "x86_64-linux"; };
+        in pkgs.mkShell {
+          packages = [
+            (with pkgs;
+              writeScriptBin "rebuild" ''
+                #!${stdenv.shell}
+                if [ -z $1 ]; then
+                  echo "Need 'switch|boot|...'"
+                  exit 1
+                fi
+
+                branch=$(${git}/bin/git branch --show-current)
+
+                sudo ${nixos-rebuild}/bin/nixos-rebuild $1 --flake . --profile-name $branch
+              '')
+            inputs.colmena.packages.x86_64-linux.colmena
+          ];
+        };
+
     };
 }