docs: add branch CI badges to README

Author: mtrezza

README.md

@@ -3,6 +3,8 @@
 ---
 
 [![Build Status](https://github.com/parse-community/parse-server/workflows/ci/badge.svg?branch=alpha)](https://github.com/parse-community/parse-server/actions?query=workflow%3Aci+branch%3Aalpha)
+[![Build Status](https://github.com/parse-community/parse-server/workflows/ci/badge.svg?branch=beta)](https://github.com/parse-community/parse-server/actions?query=workflow%3Aci+branch%3Abeta)
+[![Build Status](https://github.com/parse-community/parse-server/workflows/ci/badge.svg?branch=release)](https://github.com/parse-community/parse-server/actions?query=workflow%3Aci+branch%3Arelease)
 [![Snyk Badge](https://snyk.io/test/github/parse-community/parse-server/badge.svg)](https://snyk.io/test/github/parse-community/parse-server)
 [![Coverage](https://img.shields.io/codecov/c/github/parse-community/parse-server/alpha.svg)](https://codecov.io/github/parse-community/parse-server?branch=alpha)
 [![auto-release](https://img.shields.io/badge/%F0%9F%9A%80-auto--release-9e34eb.svg)](https://github.com/parse-community/parse-dashboard/releases)