Add buster archive source list (#3241)

Author: cotti

Dockerfile

@@ -10,6 +10,9 @@
 # and takes longer to build but that is worth it.
 FROM bitnami/minideb:buster AS base
 
+RUN echo "deb http://archive.debian.org/debian/ buster main" > /etc/apt/sources.list && \
+    echo "deb http://archive.debian.org/debian-security/ buster/updates main" >> /etc/apt/sources.list
+
 # TODO install_packages calls apt-get update and then nukes the list files after. We should avoid multiple calls to apt-get update.....
 # We could probably fix this by running the update and installs ourself with `RUN --mount type=cache` but that is "experimental"