fix(studio): use postgres user for read write operations (#4828)

Author: singh-inder

internal/start/start.go

@@ -1173,6 +1173,7 @@ EOF
 					"SNIPPETS_MANAGEMENT_FOLDER=" + containerSnippetsPath,
 					// Ref: https://github.com/vercel/next.js/issues/51684#issuecomment-1612834913
 					"HOSTNAME=0.0.0.0",
+					"POSTGRES_USER_READ_WRITE=postgres",
 				},
 				Healthcheck: &container.HealthConfig{
 					Test:     []string{"CMD-SHELL", `node --eval="fetch('http://127.0.0.1:3000/api/platform/profile').then((r) => {if (!r.ok) throw new Error(r.status)})"`},