Fix code format checker

The code format checker runs without downloading the external packages such that one has to emulate the existence of the external packages.

added BugFix Build System labels

requested review from @f.uhlig

assigned to @f.uhlig

mentioned in merge request !845 (merged)

added 2 commits

• 872e12fd - 1 commit from branch computing:master
• 5de9072a - Fix code format checker

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Dear @f.uhlig,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

added CodeOwners label

merged