figure out whether and how to test this image

[qrkourier]

Alternatives include:

1. pin semver in consuming projects instead of a major version, e.g. :v1, this way consuming projects can bump the version they're pinning at will
2. trigger C-SDK build automatically in selected consuming projects whenever changes merge to this project's trunk branch to make sure they succeed prior to publishing this project's next release
3. build the container image in PR branches and use it to build at least one C-SDK project