Add tag for mod packs (#1099)

Bypassing reqs bc i made a small change to the schema and xen and corby approved before.

* Add `symbolic` tag for mod "packs"

* Update add-mod.yml

* Add pack tag to every jam 3 mod

* Update mods.schema.json

---------

Co-authored-by: xen-42 <nicholasconnors@hotmail.ca>

.github/ISSUE_TEMPLATE/add-mod.yml

@@ -61,6 +61,7 @@ body:
         - story
         - audiovisual
         - localization
+        - pack
   - type: input
     id: authorDisplay
     attributes:

mods.json

@@ -3037,7 +3037,8 @@
         "jam",
         "content",
         "story",
-        "requires-dlc"
+        "requires-dlc",
+        "pack"
       ],
       "parent": "xen.ModJam3",
       "authorDisplay": "a bunch of people"
@@ -3735,4 +3736,4 @@
       "parent": "xen-42.ModJam5"
     }
   ]
-}
+}

mods.schema.json

@@ -71,7 +71,8 @@
                 "story",
                 "audiovisual",
                 "localization",
-                "requires-dlc"
+                "requires-dlc",
+                "pack"
               ]
             }
           },