debian: add package tests

Run both the golang tests and make sure the exporter can start.
0 jobs for !4 with test-deb
latest yaml invalid error merge request

Found errors in your .gitlab-ci.yml:

  • Included file `https://git.autistici.org/ai3/build-deb/raw/master/ci-nextstable.yml` does not have valid YAML syntax!
You can also test your .gitlab-ci.yml in CI Lint