docs(readme): update build badge

.github/workflows/build.yml

@@ -1,4 +1,4 @@
-name: Build docker image
+name: build
 
 on:
   push:

README.md

@@ -1,8 +1,8 @@
-[![Build docker image](https://github.com/tgagor/docker-centos-stream/actions/workflows/build.yml/badge.svg?branch=master)](https://github.com/tgagor/docker-centos-stream/actions/workflows/build.yml)
-
 CentOS 8 Stream Docker image
 ============================
 
+[![build](https://github.com/tgagor/docker-centos-stream/actions/workflows/build.yml/badge.svg?branch=master)](https://github.com/tgagor/docker-centos-stream/actions/workflows/build.yml)
+
 We're all divided with recent decision on changing CentOS into rolling distro. As there are no official Docker images with Stream variant, I created them on my own, based on [official instruction](https://www.centos.org/centos-stream/). Now at least I can try it and decide on my own if it's stable enough for production workloads.
 
 You can fetch docker image from: