ci: add branch

Author: jalolk

.github/workflows/test-harness.yaml

@@ -15,6 +15,7 @@ on:
     branches:
       - main
       - develop
+      - dyn/test-harness-latest # will remove after testing
     paths:
       - 'nym-vpn-core/crates/test/**'
       - 'nym-vpn-core/crates/nym-vpnd/**'