Merge pull request #9696 from basvandijk/mysql-hostname-fix

Bring hostname into scope needed by mysql_install_db

nixos/modules/services/databases/mysql.nix

@@ -167,6 +167,12 @@ in
 
         unitConfig.RequiresMountsFor = "${cfg.dataDir}";
 
+        path = [
+          # Needed for the mysql_install_db command in the preStart script
+          # which calls the hostname command.
+          pkgs.nettools
+        ];
+
         preStart =
           ''
             if ! test -e ${cfg.dataDir}/mysql; then