fix: use promtool to verify rules, fix format

services/monitoring/lgtm/alerts/forkos.yaml

@@ -1,4 +1,3 @@
-namespace: forkos
 groups:
     - name: ForkOS automation
       rules:

services/monitoring/lgtm/alerts/postgres.yml

@@ -1,4 +1,3 @@
-namespace: postgres
 groups:
     - name: PostgreSQL
       rules:

services/monitoring/lgtm/alerts/resources.yaml

@@ -1,4 +1,3 @@
-namespace: resources
 groups:
     - name: Host & hardware
       rules:

services/monitoring/lgtm/mimir.nix

@@ -12,14 +12,11 @@ let
 
   alerts = pkgs.runCommand "mimir-alerts-checked" {
     src = ./alerts;
-    nativeBuildInputs = with pkgs; [ mimir ];
+    nativeBuildInputs = with pkgs; [ prometheus.cli ];
   } ''
+    promtool check rules $src/*
     mkdir $out
     cp -R $src $out/anonymous/
-    chmod -R +w $out
-    mimirtool rules check --rule-dirs=$out/anonymous
-    mimirtool rules lint --rule-dirs=$out/anonymous
-    diff -r $src $out/anonymous
   '';
 in
 {