Dockerfile.dapper: Make dapper build again
Dockerfile.dapper: Make dapper build again

The current code on master no longer builds properly. One would get
this message:

"Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
docker-ce : Depends: containerd.io but it is not going to be
installed
E: Unable to correct problems, you have held broken packages.
The command '/bin/sh -c apt-get update &&     apt-get install -y
'docker-ce=5:18.09.1~3-0~ubuntu-xenial' bash git jq' returned a
non-zero code: 100
FATA[0287] exit status 100
make: *** [Makefile:11: ci] Error 1"

This patchset uses a contemporary golang build container to mitigate
this issue.

Signed-off-by: Joakim Roubert <5c9da96a5166f6dc7ebc31b2d2cc1da1c5d22370@axis.com>

rancher/dapper,ibuildthecloud/dapper,rancher/dapper,ibuildthecloud/dapper