## What this PR does
The cozy-lib library package got complicated enough to warrant its own
unit tests. Since unit tests are a "good thing" (tm), a somewhat generic
framework for running all kinds of unit tests was introduced into the CI
pipeline and Makefile targets. For now all it runs is `make test`
against the `packages/{library,apps,system,extra}/*` directories,
wherever a `test` target is present in the Makefile, and for now this is
only for the `cozy-lib` Helm library chart.
### Release note
```release-note
[ci,dx] Introduce a scaffold for running unit tests locally and in CI
and add the first unit tests for the cozy-lib helper Helm chart.
```
Signed-off-by: Timofei Larkin <lllamnyp@gmail.com>
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