updated docker file

Author: sandeepgupta12

.github/scripts/ppc64le/self-hosted-builder/actions-runner.Dockerfile

@@ -24,7 +24,7 @@ RUN apt-get update -o Acquire::Retries=5 -o Acquire::http::Timeout="10" && \
     vim \
     python3 \
     python3-pip \
-    apt-get clean && rm -rf /var/lib/apt/lists/*
+    rm -rf /var/lib/apt/lists/*
 
 # Switch to iptables-legacy
 RUN update-alternatives --set iptables /usr/sbin/iptables-legacy && \