Use kaniko for building docker images
While we were adding 32 bits support, we hit an issue related to https://github.com/tianon/docker-brew-ubuntu-core/issues/183 but with the following error
Get:1 http://deb.debian.org/debian sid InRelease [146 kB]
Err:1 http://deb.debian.org/debian sid InRelease
At least one invalid signature was encountered.
Reading package lists...
After spending some time... Finally we found out that passing the argument --security-opt seccomp:unconfined
the building finished successfully. In salsa is not allowed to pass --security-opt
argument when you build images using docker, so we decided to move on to kaniko which is proposed by gitlab as an alternative https://docs.gitlab.com/ce/ci/docker/using_kaniko.html.