software/gitlab: minimal rate-limiting of archive downlaods with nginx

nginx is not really flexible for this, but since gitlab does not make
download of archive configurable, this adds a rate limit of 1 request
per minute per source IP for archive downloads.
4 jobs for feat/gitlab-authenticate-to-backend in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.Eggs.UnitTest-TestRunner1.Python2

00:26:58

passed SlapOS.Eggs.UnitTest-TestRunner1.Python3

00:26:37

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

13:17:17

canceled SlapOS.Theia.ResilienceTest-ForTestRunner1-Gitlab

00:10:23