The output of our test scripts is captured by gitlab. It does however
sanitize things that look like secrets. So it was reasonably save
to call `env` from within the test script.
Next, we will redirect (`tee`) the output of the test script to a
file and archive it. When we do that, the output does not get sanitized
and can be downloaded from the artifacts page.
Stop running `env` as part of the test script. Do it instead as a
separate step. After all, it is useful to see the environment variables
of the test. But sanitized.
It's true, that our gitlab-ci test mostly consists of building NetworkManager.
Hence the name of the script was not entirely wrong. But it's not only building.
I think "run-test.sh" is a much better name. Rename.