making new docker builder image is broken in xenial

[kushaldas]

Description

The Dockerfile to create a new builder image for Xenial is broken.

Steps to Reproduce

• cd molecule/builder-xenial
• make

Expected Behavior

• This should create a new docker image

Actual Behavior

Failing with error like:

127 added, 0 removed; done.
Running hooks in /etc/ca-certificates/update.d...
done.
Processing triggers for sgml-base (1.26+nmu4ubuntu1) ...
Removing intermediate container 708a61c9db0b
 ---> 261ecf55e951
Step 5/10 : RUN echo "deb https://deb.debian.org/debian unstable main contrib" > /etc/apt/sources.list.d/debian-unstable.list
 ---> Running in e49db1f15227
Removing intermediate container e49db1f15227
 ---> c6977474d067
Step 6/10 : COPY aptpreferences.conf /etc/apt/preferences.d/debian-unstable
 ---> 39ef5cc1127a
Step 7/10 : RUN apt-get install -y debian-archive-keyring
 ---> Running in 83fb83c6eb33
Reading package lists...
Building dependency tree...
Reading state information...
E: Unable to locate package debian-archive-keyring
The command '/bin/sh -c apt-get install -y debian-archive-keyring' returned a non-zero code: 100
make: *** [Makefile:7: build-container] Error 100

Comments

• Most probably missing apt update step after adding the debian repo and needs apt https magic.

[conorsch]

I can repro, will attempt a fix.

[conorsch]

Same problem does not affect the new focal builder. Will test again during re-review of #5465 to be sure.