Set ubuntu 20.04 as new base image

We would at some point need to set this as the default. To prepare for that, I think we should make this an option that is available, and run our tests on this too. The R stack seems possibly currently unavailable for 20.04 (see https://community.rstudio.com/t/rstudio-server-ubuntu-20-04/64188) but I'll try it out
jupyterhub · Jun 3, 2022 · 07063ca · 07063ca
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diff --git a/repo2docker/buildpacks/base.py b/repo2docker/buildpacks/base.py
@@ -12,7 +12,7 @@
 
 # Only use syntax features supported by Docker 17.09
 TEMPLATE = r"""
-FROM buildpack-deps:bionic
+FROM buildpack-deps:focal
 
 # Avoid prompts from apt
 ENV DEBIAN_FRONTEND=noninteractive

diff --git a/tests/memlimit/dockerfile/Dockerfile b/tests/memlimit/dockerfile/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:bionic
+FROM ubuntu:focal
 
 RUN apt-get update && apt-get install --yes python3