util/docker/coreboot-sdk: Add bash-completion to package list

Change-Id: I97756f603e304c6b50387ba2aaac416ae31db681
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78493
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@gmail.com>

util/docker/coreboot-sdk/Dockerfile

@@ -15,6 +15,7 @@ RUN \
 	useradd -p locked -m coreboot && \
 	apt-get -qq update && \
 	apt-get -qqy install --no-install-recommends \
+		bash-completion \
 		bc \
 		bison \
 		bsdextrautils \