Merge pull request #123 from fhem/dependabot/docker/debian-buster-202… #280

Job	Run time
test_build (Dockerfile)	11m 34s
test_build (Dockerfile-bullseye)	9m 50s
published_build (Dockerfile)	41m 52s
published_build (Dockerfile-bullseye)	1h 3m 42s
	2h 6m 58s

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