fix pruning

templates/etc/koji-gc/koji-gc.conf.j2

@@ -29,7 +29,17 @@ policy =
     #stuff to protect
     #note that tags with master lock engaged are already protected
     tag *-updates :: keep
-    age < 1 day :: skip
+    # protect modules
+    tag *-modular-* :: keep
+    tag *-modular :: keep
+    tag module-* :: keep
+    # protect infra
+    tag *-infra :: keep
+    # general age
+    age < 30 day :: skip
+
+    # sig protect
+    sig signing && age < 16 weeks :: keep
 
     #stuff to chuck semi-rapidly
     tag *-testing *-candidate :: {  # nested rules