set required minimum coverage value

Signed-off-by: Karl W Schulz <karl.schulz@amd.com>

.github/workflows/mi100.yml

@@ -80,6 +80,7 @@ jobs:
         if: always()
         with:
           path: src/coverage.xml
+          minimum_coverage: 45
 
 ## ##       - name: Pytest coverage comment
 ## ##         if: '!cancelled()'