Sort community filter options alphabetically on package listing admin

Custom filter was used rather than the ordering meta field of the
Community class since the latter might have some uninteded consequences
elsewhere.

django/thunderstore/community/admin/package_listing.py

@@ -3,11 +3,13 @@
 
 from django.contrib import admin
 from django.db import transaction
-from django.db.models import QuerySet
+from django.db.models import Q, QuerySet
+from django.http import HttpRequest
 from django.utils.safestring import mark_safe
 
 from ..consts import PackageListingReviewStatus
 from ..forms import PackageListingAdminForm
+from ..models.community import Community
 from ..models.package_listing import PackageListing
 
 
@@ -31,6 +33,18 @@ def approve_listing(modeladmin, request, queryset: QuerySet[PackageListing]):
 approve_listing.short_description = "Approve"
 
 
+class CommunityFilter(admin.SimpleListFilter):
+    title = "Community"
+    parameter_name = "community"
+
+    def lookups(self, request: HttpRequest, model_admin):
+        return Community.objects.order_by("name").values_list("identifier", "name")
+
+    def queryset(self, request: HttpRequest, queryset: QuerySet[PackageListing]):
+        if self.value():
+            return queryset.exclude(~Q(community__identifier=self.value()))
+
+
 @admin.register(PackageListing)
 class PackageListingAdmin(admin.ModelAdmin):
     form = PackageListingAdminForm
@@ -44,7 +58,7 @@ class PackageListingAdmin(admin.ModelAdmin):
         "has_nsfw_content",
         "is_review_requested",
         "review_status",
-        "community",
+        CommunityFilter,
     )
     list_display = (
         "id",