The linkchecker tool is now being used to find broken links in our websites. Since it's not needed for building anything, just add it to the jenkins-node Dockerfile instead. Signed-off-by: Martin Roth <martin@coreboot.org> Change-Id: Iac2246b5378e556b5cd9f2107fc5a7e51d583b5b Reviewed-on: https://review.coreboot.org/c/coreboot/+/62445 Reviewed-by: Felix Singer <felixsinger@posteo.net> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>