Installed dnsutils in Dockerfile (#49)

Dockerfile

@@ -25,13 +25,14 @@ RUN --mount=type=cache,target=/var/cache/apt,id=ubuntu22-apt-$TARGETPLATFORM \
  libaio1 libaio-dev \
  libncurses5 libnuma-dev \
  bc default-jdk maven \
- sudo iproute2
+ sudo iproute2 dnsutils
  # Java & Maven are required by YCSB
  # bc is required by dbt2
  # libaio is a dynamic library used by RonDB
  # libncurses5 & libnuma-dev are required for x86 only
  # sudo is required in the entrypoint
  # iproute2 is for using the command `ss`
+ # dnsutils is for using the command `nslookup` in K8s
 
 # Let PATH survive through sudo
 RUN sed -ri '/secure_path/d' /etc/sudoers