chore(Dockerfile): 建置時驗證 Codex 帳號電子郵件

app/verify_codex_email.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+# 驗證 codex-account 取得的登入 email 是否符合 EXPECTED_CODEX_EMAIL。
+
+set -eu
+
+expected_email="${EXPECTED_CODEX_EMAIL:-temp@gmail.com}"
+actual_email="$(codex-account)"
+
+if [ "$actual_email" = "$expected_email" ]; then
+  printf 'Codex account email verified: %s\n' "$actual_email"
+  exit 0
+fi
+
+printf 'Codex account email mismatch: expected %s, got %s\n' \
+  "$expected_email" "${actual_email:-<empty>}" >&2
+exit 1