ci: rename workflow to build

Looks better in a README badge

.github/workflows/build.yml

@@ -1,7 +1,7 @@
 # This workflow will build a golang project
 # For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-go
 
-name: Build and test
+name: build
 
 on:
   push: