Integrate gitlab-ci/another-improvement-for-build-up-to-date-job-message and 5 more

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@1830cb02

And another improvement for the build-up-to-date job

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@f7f33de5

Improve the output message in the build-up-to-date job a bit more

Use explicit line breaks to make the message look better.

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@68aaab94

Improve the output message in the build-up-to-date job

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@26b9eb1d

Rename "check" job to "build-up-to-date"

This is a more meaningful name and might give a hint what the job does.

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@07f0c898

Make build runner tag configurable

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@0d70d719

Disable sourcery check

Sourcery changed its license model to only be available for open source
projects with the free plan. According to the documentation, sourcery
should detect automatically whether it is running on an open source
repo. This does not work in our case, though. Disable it until we find a
way to correctly make it work.