[skip ci]Add comment for github action (#9028)

Signed-off-by: Nzhuwenxing <wenxing.zhu@zilliz.com>

.github/workflows/network-partition-chaos-test.yaml

@@ -47,6 +47,7 @@ jobs:
           helm search repo chaos-mesh
           kubectl create ns chaos-testing
           helm install chaos-mesh chaos-mesh/chaos-mesh -n=chaos-testing --version v2.0.1 --set chaosDaemon.runtime=containerd --set chaosDaemon.socketPath=/run/containerd/containerd.sock
+          # wait for all pod running 
           sleep 60s
           kubectl get po -n chaos-testing
 
@@ -55,17 +56,20 @@ jobs:
         run: |
           helm repo add milvus https://milvus-io.github.io/milvus-helm
           helm repo update
+          # install milvus with latest image
           helm install chaos-testing milvus/milvus --set cluster.enabled=true --set image.all.repository=milvusdb/milvus-dev --set image.all.tag=master-latest -n=chaos-testing
           kubectl get pods -n chaos-testing
           sleep 60s
           kubectl get pods -n chaos-testing
           kubectl port-forward service/chaos-testing-milvus 19530 -n chaos-testing >/dev/null 2>&1 &
           sleep 20s
+          # check whether port-forward success
           nc -vz 127.0.0.1 19530
       - name: Chaos Test
         shell: bash
         working-directory: tests/python_client/chaos
         run: |
+          # replace chaos object
           sed -i "s/ALL_CHAOS_YAMLS =.*/ALL_CHAOS_YAMLS = \'chaos_${{ matrix.pod }}_network_partition.yaml\'/g" constants.py
           cat constants.py
           pytest -s -v test_chaos.py --host 127.0.0.1 --log-level=INFO --tb=no