feat(renovate): enable lockFileMaintenance

This allows it to update the flake.lock and Cargo.lock files.

Also switch from a flake ref to a github ref as renovate cannot resolve
flake refs.

flake-modules/tests.nix

@@ -6,6 +6,7 @@
       checks =
         let
           testDomain = "webnstest.example";
+          dynamicZonesDir = "/var/lib/named/zones";
           zoneFile = pkgs.writeText "${testDomain}.zoneinfo" ''
             $ORIGIN .
             $TTL 60 ; 1 minute
@@ -26,14 +27,7 @@
             nsupdate                  IN  AAAA  ::1
           '';
 
-          webnsupdate-machine =
-            { config, ... }:
-            let
-              bindCfg = config.services.bind;
-              bindData = bindCfg.directory;
-              dynamicZonesDir = "${bindData}/zones";
-            in
-            {
+          webnsupdate-machine = {
             imports = [ self.nixosModules.webnsupdate ];
 
             config = {
@@ -77,8 +71,9 @@
                 # shellcheck disable=SC2211,SC1127
                 rm -f ${dynamicZonesDir}/* # reset dynamic zones
 
-                  mkdir -m 0755 -p ${dynamicZonesDir}
-                  chown named ${dynamicZonesDir}
+                ${pkgs.coreutils}/bin/mkdir -m 0755 -p ${dynamicZonesDir}
+                chown "named" ${dynamicZonesDir}
+                chown "named" /var/lib/named
 
                 # copy dynamic zone's file to the dynamic zones dir
                 cp ${zoneFile} ${dynamicZonesDir}/${testDomain}
@@ -92,7 +87,6 @@
             nodes.machine = webnsupdate-machine;
             testScript = ''
               machine.start(allow_reboot=True)
-              machine.wait_for_unit("bind.service")
               machine.wait_for_unit("webnsupdate.service")
 
               # ensure base DNS records area available