ci: update badge in README and add push event trigger (#12592)

.github/workflows/ci-tests.yml

@@ -1,8 +1,6 @@
 name: CI
 
-on:
-  pull_request:
-  workflow_dispatch:
+on: [pull_request, workflow_dispatch, push]
 
 jobs:
   test:

README.md

@@ -14,8 +14,8 @@
 </div>
 
 <div align="center">
-    <a href="https://travis-ci.com/frappe/frappe">
-        <img src="https://travis-ci.com/frappe/frappe.svg?branch=develop">
+    <a href="https://github.com/frappe/frappe/actions/workflows/ci-tests.yml">
+        <img src="https://github.com/frappe/frappe/actions/workflows/ci-tests.yml/badge.svg?branch=develop">
     </a>
     <a href='https://frappeframework.com/docs'>
         <img src='https://img.shields.io/badge/docs-📖-7575FF.svg?style=flat-square'/>