[skip ci] Fix CI badge in README

push.yml has been unified with nightly.yml into test.yml.

Author: iluuu1994

README.md

@@ -14,7 +14,7 @@ web development. Fast, flexible and pragmatic, PHP powers everything from your
 blog to the most popular websites in the world. PHP is distributed under the
 [PHP License v3.01](LICENSE).
 
-[![Push](https://github.com/php/php-src/actions/workflows/push.yml/badge.svg)](https://github.com/php/php-src/actions/workflows/push.yml)
+[![Test](https://github.com/php/php-src/actions/workflows/test.yml/badge.svg)](https://github.com/php/php-src/actions/workflows/test.yml)
 [![Fuzzing Status](https://oss-fuzz-build-logs.storage.googleapis.com/badges/php.svg)](https://issues.oss-fuzz.com/issues?q=project:php)
 
 ## Documentation