Update .gitlab-ci.yml; try fix for REPO_MIRROR

7 jobs for master in 4 minutes and 5 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Environment
passed #387204968
environment

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  Build
canceled #387204973
build-bpi-r2

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canceled #387204972
build-malta

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canceled #387204971
build-rpi3

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canceled #387204975
build-rpi4

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canceled #387204974
build-x64

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  Deployment
canceled #387204976
deployment