Publish backend-url and change username to admin for Theia

See merge request !937
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Status Job ID Name Coverage
  External
passed SlapOS.SlapRunner.ResilienceTest-Master

00:23:27

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

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passed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

05:21:23