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* Provide version information through labels Can be retrieved by calling e.g. `docker inspect -f {{.Config.Labels}} tvial/docker-mailserver:testing` Signed-off-by: Felix Bartels <felix@host-consultants.de> * add build hook so that Docker Hub can work with the build args Signed-off-by: Felix Bartels <felix@host-consultants.de> * remove obsolete build-no-cache build args invalidate build cache already Signed-off-by: Felix Bartels <felix@host-consultants.de> * adapt travis file Signed-off-by: Felix Bartels <felix@host-consultants.de> * shellcheck Signed-off-by: Felix Bartels <felix@host-consultants.de>