chore: fix fork e2es (#4813)

Author: chatton

.github/workflows/e2e-fork.yml

@@ -32,6 +32,7 @@ jobs:
       CHAIN_A_TAG: latest
       CHAIN_B_TAG: latest
       CHAIN_IMAGE: ibc-go-simd
+      RELAYER_ID: "hermes" # by default use hermes for fork e2es.
     if: ${{ github.event.pull_request.head.repo.fork || github.actor == 'dependabot[bot]' || github.event_name == 'workflow_dispatch' }}
     needs:
       - build-test-matrix