Fix migrate.sh auth failure by overriding built-in script

The Supabase postgres image includes a migrate.sh that tries to connect
as supabase_admin without proper credentials. Override it with an empty
script since migrations are handled by init.sql.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

deploy/docker-compose.yml

@@ -32,6 +32,7 @@ services:
     volumes:
       - db-data:/var/lib/postgresql/data
       - ./init.sql:/docker-entrypoint-initdb.d/init.sql:ro
+      - ./migrate.sh:/docker-entrypoint-initdb.d/migrate.sh:ro
       - ./zz-set-passwords.sh:/docker-entrypoint-initdb.d/zz-set-passwords.sh:ro
     healthcheck:
       test: ["CMD-SHELL", "pg_isready -U postgres"]

deploy/migrate.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+# Override the default Supabase migrate.sh
+# Our migrations are handled via init.sql which runs as postgres user
+echo "Skipping built-in migrate.sh - migrations handled by init.sql"
+exit 0