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b829e96cde
This changes the way onbuild works: - forbids the chaining of onbuild instructions - forbids the use of `onbuild from` - forbids the use of `onbuild maintainer` It also makes docker throw errors when encountering such triggers when executing the triggers during `FROM`. Three tests have been added: - ensure that chained onbuild (`onbuild onbuild`) is forbidden - ensure that `onbuild from` is forbidden - ensure that `onbuild maintainer` is forbidden Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)