git not installed causes Gitlab CI job to fail silently

See https://gitlab.isc.org/isc-projects/kea/-/jobs/1445440 for:

git: command not found

After pushing a new image with git installed

FROM ubuntu:latest AS gitlab-ci

# Install dependencies.
RUN apt-get update
RUN apt-get dist-upgrade -y
RUN apt-get install -y git shellcheck

there is another error caused by badly written CI file.

https://gitlab.isc.org/isc-projects/kea/-/jobs/1449004

test: too many arguments