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On some Debian installations, the following command
docker version --format '{{.Server.Version}}'
returns a version number with +dfsg... added, for example:
20.10.5+dfsg1
After removing the dots, the comparison of DOCKER_VERSION with MIN_DOCKER_VERSION throws
./buildContainerImage.sh: line 97: [: 20105+dfsg1: integer expression expected
This pull request also adds the substring +dfsg* from the version number in order for the comparison to have numerical values on both sides.