Show build status of posix & S32k148

-  This shows the build status of the latest push event on the main branch only.
-  Testing badges of s32k and posix

Author: SuhashiniNaik

README.md

@@ -3,10 +3,7 @@
 
 ## Build Status 🚀
 
-| Platform       | Status                                                                 |
-|----------------|------------------------------------------------------------------------|
-| POSIX Build | ![POSIX](https://github.com/eclipse-openbsw/openbsw/actions/workflows/build.yml/badge.svg?branch=main&event=push&matrix.platform=posix) |
-| S32K148     | ![S32K](https://github.com/eclipse-openbsw/openbsw/actions/workflows/build.yml/badge.svg?branch=main&event=push&matrix.platform=s32k148) |
+[![Build S32k and posix platform](https://github.com/eclipse-openbsw/openbsw/actions/workflows/build.yml/badge.svg?branch=main&event=push)](https://github.com/eclipse-openbsw/openbsw/actions/workflows/build.yml)
 
 ## Code Coverage