.gitlab-ci.yml: added i386 build

Nikos Mavrogiannopoulosrequested to merge
tmp-add-x86 into master

This introduces an i386 CI build to catch issues that relate to 32-bit systems.

Signed-off-by: Nikos Mavrogiannopoulos nmav@redhat.com

Edited by Nikos Mavrogiannopoulos

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