add iputils-ping

add iputils-ping

diff --git a/Dockerfile b/Dockerfile
index 481dda9..14913a7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,6 +7,7 @@ RUN DEBIAN_FRONTEND=noninteractive apt-get update \
     curl \
     gdb \
     iproute2 \
+    iputils-ping \
     jq \
     less \
     lsof \

GitHub sha: 4f2c3d7145abb8dc41193fe1bc42e29a9332d4de