remove redundant 'apt-get clean' in Dockerfile

Dockerfile

@@ -2,14 +2,14 @@ FROM ubuntu:latest as base
 ENV DEBIAN_FRONTEND='noninteractive'
 RUN apt-get update && apt-get upgrade -y && \
     apt-get install -y aria2 curl ffmpeg jq libc++-dev locales nano pv python3 python3-pip python3-lxml tzdata && \
-    apt-get clean && rm -rf /var/lib/apt/lists/*
+    rm -rf /var/lib/apt/lists/*
 RUN locale-gen en_US.UTF-8
 
 FROM ubuntu:latest as api
 ENV DEBIAN_FRONTEND='noninteractive'
 RUN apt-get update && apt-get upgrade -y && \
     apt-get install -y git gperf make cmake clang-10 libc++-dev libc++abi-dev libssl-dev zlib1g-dev && \
-    apt-get clean && rm -rf /var/lib/apt/lists/*
+    rm -rf /var/lib/apt/lists/*
 WORKDIR /root
 RUN git clone --recursive https://github.com/tdlib/telegram-bot-api.git && cd telegram-bot-api && \
     git checkout e9587a0 && git submodule update && mkdir build && cd build && \
@@ -24,7 +24,7 @@ RUN apt-get update && apt-get upgrade -y && \
     apt-get install -y autoconf automake gcc g++ git libtool make python3 python3-dev python3-distutils python3-pip && \
     apt-get install -y libc-ares-dev libcrypto++-dev libcurl4-openssl-dev libfreeimage-dev libsodium-dev && \
     apt-get install -y libsqlite3-dev libssl-dev swig zlib1g-dev && \
-    apt-get clean && rm -rf /var/lib/apt/lists/*
+    rm -rf /var/lib/apt/lists/*
 WORKDIR /root
 RUN git clone https://github.com/meganz/sdk.git mega-sdk/ && cd mega-sdk/ && \
     git checkout v3.9.10 && \
@@ -49,7 +49,7 @@ RUN apt-get update && apt-get upgrade -y && \
     apt-get install -y qbittorrent-nox && \
     apt-get purge -y software-properties-common && \
     apt-get autoremove -y && \
-    apt-get clean && rm -rf /var/lib/apt/lists/*
+    rm -rf /var/lib/apt/lists/*
 RUN pip3 install --no-cache-dir /root/mega-sdk/bindings/python/dist/megasdk-*.whl
 WORKDIR /usr/src/app
 RUN chmod 777 /usr/src/app

tgmb/__init__.py

@@ -5,7 +5,6 @@
 # TODO: code for direct link generation
 # TODO: add hard-restart (restart all subprocesses)
 # TODO: decide between confDefaults and optVals for AriaHelper, QbitTorrentHelper
-# TODO: remove redundant 'apt-get clean' in Dockerfile
 import aria2p
 import asyncio
 import googleapiclient.discovery