Other remotes are mirrors of gerrit one, which means there's some delay
between pushing some ref to the gerrit remote and having them available
in the mirrors.
Hence, it becomes annoying while developing and new stuff to test is
pushed. Let's simply use gerrit since it's the master remote.
Change-Id: Ic87c196f8b91a3a3e6ddde2cca36482ce7070df7
So far we were executing all our TTCN-3 tests from a container
image with Debian stretch (9) plus a custom more recent eclipse-titan
package from the osmocom feed.
Let's update the container base OS from stretch (9) to bullseye (11)
while using the same packaged eclipse-titan version (8.0.0) for running
the tests. So this should be a low-risk change, as titan runtime
remains identical.
I've executed all test suites locally and couldn't see any regressions.
Related: OS#4969
Change-Id: Ib3bdfa3bec8f8ef42c55ca61cdee8fbca923874f