chore: fix broken build link in README (#27)

README.md

@@ -1,6 +1,6 @@
 [![Contributions Welcome](https://img.shields.io/badge/contributions-welcome-brightgreen.svg?style=flat)](https://github.com/spectrocloud-labs/validator-plugin-maas/issues)
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
-![Build](https://github.com/spectrocloud-labs/validator-plugin-maas/actions/workflows/build_container.yaml/badge.svg)
+![Test](https://github.com/spectrocloud-labs/validator-plugin-maas/actions/workflows/test.yaml/badge.svg)
 [![Go Report Card](https://goreportcard.com/badge/github.com/spectrocloud-labs/validator-plugin-maas)](https://goreportcard.com/report/github.com/spectrocloud-labs/validator-plugin-maas)
 [![codecov](https://codecov.io/github/spectrocloud-labs/validator-plugin-maas/graph/badge.svg?token=Q15XUCRNCN)](https://codecov.io/github/spectrocloud-labs/validator-plugin-maas)
 [![Go Reference](https://pkg.go.dev/badge/github.com/spectrocloud-labs/validator-plugin-maas.svg)](https://pkg.go.dev/github.com/spectrocloud-labs/validator-plugin-maas)