chore: add codecov configuration

Signed-off-by: Fabrizio Sestito <[email protected]>

codecov.yml

@@ -0,0 +1,9 @@
+coverage:
+  status:
+    project:
+      default:
+        threshold: 1%
+ignore:
+  - pkg/apis/policies/v1/zz_generated.deepcopy.go
+  - pkg/apis/policies/v1alpha2
+  - internal/pkg/constants