Remove Docker-in-Docker-related code

[marvinruder]

No description provided.

[codacy-production]

Coverage summary from Codacy

Merging #382 (0d45f53) into main (0c61de8) - See PR on Codacy

Coverage variation	Diff coverage
+0.00%	∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (0c61de8)	8840	8840	100.00%
Head commit (0d45f53)	8840 (+0)	8840 (+0)	100.00% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#382)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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