Draft: Enable `FF_NETWORK_PER_BUILD` feature flag
Enables the FF_NETWORK_PER_BUILD
feature flag to create a network per
build so that every job has its own isolated network and can talk to one
another without any problems.
Created per the comment here: https://gitlab.com/gitlab-org/gitlab-qa/-/merge_requests/551#note_439732205
Docs: https://docs.gitlab.com/runner/executors/docker.html#network-per-build
Edited by George Koltsov