oscar: Enable adb

Among other effects, this module installs the `android-tools` package,
which also provides `fastboot`.

oscar/configuration.nix

@@ -118,7 +118,7 @@
   # Define a user account. Don't forget to set a password with ‘passwd’.
   users.users.chandler.isNormalUser = true;
   users.users.chandler.description = "Chandler Swift";
-  users.users.chandler.extraGroups = [ "networkmanager" "wheel" "dialout" "cdrom" "plugdev" ];
+  users.users.chandler.extraGroups = [ "networkmanager" "wheel" "dialout" "cdrom" "plugdev" "adbusers" ];
   home-manager.backupFileExtension = "backup";
   home-manager.users.chandler = { pkgs, ... }: {
 
@@ -185,6 +185,8 @@
 
     programs.thunderbird.enable = true;
 
+    programs.adb.enable = true;
+
     programs.bash.enable = true;
 
     programs.direnv = {