util/docker/Makefile: Add documentation docker image targets

Run
- make -C util/docker doc.coreboot.org to build the docker image
- make -C util/docker docker-build-docs to build the documentation
- make -C docker-livehtml-docs to serve autoupdated documentation over
  http://0.0.0.0:8000

Change-Id: Ic07f216f8d90d6e212383250b852dc91575304c3
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36104
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions