Add CI test stagegenerate-client-codeWithCI

Squashed with:

Pass artifacts (well, the whole repo) to test stage

YAML syntax error. Since I saw a glimpse of the repo being reinitialised
two tries ago, perhaps it saves everything tracked and just adding
untracked files should be enough.

Have to specify which image to use, else it uses default and fails with
linking errors.

Have to reinstall everything in the new image.

Though not strictly required, but it's good to have a working git describe output in logs.

gdb is required for tests, too

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