lemmy: fix the perms when running db migrations

overlays/pins.nix

@@ -28,4 +28,30 @@
   #     })
   #   ];
   # });
+  lemmy-server = prev.lemmy-server.overrideAttrs (upstream: {
+    patches = upstream.patches or [] ++ [
+      # "thread 'main' panicked at 'Couldn't run DB Migrations: Failed to run 2022-07-07-182650_comment_ltrees with: permission denied: "RI_ConstraintTrigger_a_647340" is a system trigger', crates/db_schema/src/utils.rs:165:25"
+      (next.writeText "fix-db-migrations" ''
+        diff --git a/migrations/2022-07-07-182650_comment_ltrees/up.sql b/migrations/2022-07-07-182650_comment_ltrees/up.sql
+        index fde9e1b3..55b96dac 100644
+        --- a/migrations/2022-07-07-182650_comment_ltrees/up.sql
+        +++ b/migrations/2022-07-07-182650_comment_ltrees/up.sql
+        @@ -60,7 +60,7 @@ ORDER BY
+                breadcrumb;
+
+         -- Remove indexes and foreign key constraints, and disable triggers for faster updates
+        -alter table comment disable trigger all;
+        +-- alter table comment disable trigger all;
+
+         alter table comment drop constraint if exists comment_creator_id_fkey;
+         alter table comment drop constraint if exists comment_parent_id_fkey;
+        @@ -115,4 +115,4 @@ create index idx_path_gist on comment using gist (path);
+         -- Drop the parent_id column
+         alter table comment drop column parent_id cascade;
+
+        -alter table comment enable trigger all;
+        +-- alter table comment enable trigger all;
+      '')
+    ];
+  });
 })