Make build job names more descriptive (#2657)

Previously every build showed up in the CI as "build".

Update the job names to reflect what they are. For example the Ubuntu
build is now called "ubuntu_build"

Co-authored-by: Patrick <tingping@tingping.se>

.github/workflows/windows-build.yml

@@ -2,7 +2,7 @@ name: Windows Build
 on: [push, pull_request]
 
 jobs:
-  build:
+  windows_build:
     runs-on: windows-2019
     strategy:
       matrix: