use socket-only postgres

backend/.env.example

@@ -22,10 +22,10 @@ LOG_DEPRECATIONS_CHANNEL=null
 LOG_LEVEL=debug
 
 DB_CONNECTION=pgsql
-DB_HOST=127.0.0.1
+DB_HOST="${PGHOST}"
 DB_PORT=5432
-DB_DATABASE=backend
-DB_USERNAME=root
+DB_DATABASE=postgres
+DB_USERNAME=postgres
 DB_PASSWORD=
 
 SESSION_DRIVER=database

flake.nix

@@ -36,7 +36,6 @@
               echo "[pg] initializing cluster at $PGDATA"
               initdb --auth=trust --username=postgres --no-locale --encoding=UTF8 >/dev/null
               {
-                echo "listen_addresses = '127.0.0.1'"
                 echo "unix_socket_directories = '$PGDATA'"
               } >> "$PGDATA/postgresql.conf"
             fi

process-compose.yml

@@ -2,7 +2,7 @@ version: "0.5"
 
 processes:
   postgres:
-    command: postgres -D "$PGDATA" -k "$PGDATA" -c listen_addresses=127.0.0.1
+    command: postgres -D "$PGDATA" -k "$PGDATA" -c listen_addresses=
     shutdown:
       signal: 2
     readiness_probe: