add socat

add socat

diff --git a/Dockerfile b/Dockerfile
index 0603a29..9b0fe28 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,6 +11,7 @@ RUN DEBIAN_FRONTEND=noninteractive apt-get update \
     net-tools \
     netcat-openbsd \
     procps \
+    socat \
     strace \
     tcpdump \
     vim \

GitHub sha: bc1b47a9a44029cdac27442c542a123c9f851d88