YAML Formatting at a example workflow

YAML Format of the code at 'Example usage' with Environment Variables
2020-08-15 18:12:04 +02:00 · 2020-08-15 18:12:04 +02:00 · c7a4f4e270
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--- a/README.md
+++ b/README.md
@ -78,7 +78,7 @@ Some environment variables may be necessary for your particular case or to impro
 - DOTNET_MULTILEVEL_LOOKUP - configures whether the global install location is used as a fall-back (default: true)

 Example usage:
-```
+```yaml
 build:
  runs-on: ubuntu-latest
  env: