test: realtime publication

Only includes a publication, but a dedicated file for realtime for
improved visibility.

Author: steve-chavez

Diff for: nix/tests/expected/realtime.out

@@ -0,0 +1,16 @@
+-- only a publication from supabase realtime is expected
+SELECT
+    pubname AS publication_name,
+    pubowner::regrole AS owner,
+    puballtables,
+    pubinsert,
+    pubupdate,
+    pubdelete,
+    pubtruncate
+FROM
+    pg_publication;
+ publication_name  |  owner   | puballtables | pubinsert | pubupdate | pubdelete | pubtruncate 
+-------------------+----------+--------------+-----------+-----------+-----------+-------------
+ supabase_realtime | postgres | f            | t         | t         | t         | t
+(1 row)
+

Diff for: nix/tests/sql/realtime.sql

@@ -0,0 +1,11 @@
+-- only a publication from supabase realtime is expected
+SELECT
+    pubname AS publication_name,
+    pubowner::regrole AS owner,
+    puballtables,
+    pubinsert,
+    pubupdate,
+    pubdelete,
+    pubtruncate
+FROM
+    pg_publication;