ci: skip flaky Codecov CLI signature validation

Author: e-desouza

.github/workflows/integration_test.yml

@@ -82,6 +82,9 @@ jobs:
           files: lcov.info
           flags: integration
           fail_ci_if_error: true
+          # Codecov's keybase-hosted GPG key import is currently flaky; keep
+          # upload failures meaningful by skipping only CLI integrity validation.
+          skip_validation: true
 
       - name: Upload coverage report
         if: always()