Clean up apt lists files in Dockerfile for smaller image

Author: PeterDaveHello

Dockerfile

@@ -2,6 +2,7 @@ FROM python:3
 
 RUN apt-get update && \
 apt-get -y --no-install-recommends install automake libtool make gcc git python3-pip && \
+rm -rf /var/lib/apt/lists/* && \
 pip3 --no-cache-dir install yara-python && \
 wget https://github.com/VirusTotal/yara/archive/v3.8.1.tar.gz -O yara.tar.gz && \
 tar -zxf yara.tar.gz && \