.gitlab-ci.yml: Factor out common job settings
Factor out the settings common to runner-config, diff-job, and
apply-job into the .common template.
Set DEBIAN_FRONTEND=noninteractive before running apt-get install.
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Factor out the settings common to runner-config, diff-job, and
apply-job into the .common template.
Set DEBIAN_FRONTEND=noninteractive before running apt-get install.