hydra: add manual psql users

modules/services/server/postgresql.nix

@@ -30,7 +30,15 @@
         host   signaldb      mautrixsignal  localhost scram-sha-256
         host   onlyoffice    onlyoffice     localhost scram-sha-256
         local  onlyoffice    onlyoffice     peer
-        local  hydra         hydra          peer
+        local  hydra         all            ident map=hydra-users
+    '';
+    identMap = ''
+      hydra-users hydra hydra
+      hydra-users hydra-queue-runner hydra
+      hydra-users hydra-www hydra
+      hydra-users root hydra
+      # The postgres user is used to create the pg_trgm extension for the hydra database
+      hydra-users postgres postgres
     '';
     initialScript = config.age.secrets."services/postgresql/initScript.sql".path;
   };