Fix buster docker build

Author: theyosh

Dockerfile.buster

@@ -31,7 +31,6 @@ ENV PATH="/opt/venv/bin:$PATH"
 
 # Some strange DNS issues with installing PGP keys. keyserver.ubuntu.com => 185.125.188.26
 RUN  apt-get -o Acquire::ForceIPv4=true install -y --no-install-recommends gnupg libxslt1-dev libxml2-dev \
-  && echo "deb http://raspbian.raspberrypi.org/raspbian/ buster main contrib non-free rpi" > /etc/apt/sources.list.d/raspberrypi.list \
   && echo "deb http://archive.raspberrypi.org/debian/ buster main" >> /etc/apt/sources.list.d/raspberrypi.list \
   && apt-key adv --keyserver 185.125.188.26 --recv-keys 9165938D90FDDD2E 82B129927FA3303E
 
@@ -131,6 +130,7 @@ RUN  rm /usr/local/lib/libsispmctl.so /usr/local/lib/libsispmctl.so.0 \
 RUN  echo "deb http://archive.debian.org/debian/ buster main contrib non-free" > /etc/apt/sources.list \
   && echo "deb http://archive.debian.org/debian/ buster-proposed-updates main contrib non-free" >> /etc/apt/sources.list \
   && echo "deb http://archive.debian.org/debian-security buster/updates main contrib non-free" >>  /etc/apt/sources.list \
+  && sed -i 's/.*deb.debian.org.*//g' /etc/apt/sources.list \
   && apt-get -o Acquire::ForceIPv4=true update \
   && apt-get -o Acquire::ForceIPv4=true full-upgrade -y --no-install-recommends \
   && apt-get -o Acquire::ForceIPv4=true install -y --no-install-recommends sudo netcat-openbsd procps bluez pigpio ffmpeg libxslt1.1 libftdi1 libatlas3-base libgfortran5 libraspberrypi-bin ${JAVA} \