Add bash completion for `dockerd --init` and `docker run|create --init`

Fixes #30263

Signed-off-by: Harald Albers <github@albersweb.de>
(cherry picked from commit 20762617572f2e02b8e397844343083506144e86)
Signed-off-by: Victor Vieux <vieux@docker.com>

contrib/completion/bash/docker

@@ -1372,6 +1372,7 @@ _docker_container_run() {
 	local boolean_options="
 		--disable-content-trust=false
 		--help
+		--init
 		--interactive -i
 		--oom-kill-disable
 		--privileged
@@ -1728,6 +1729,7 @@ _docker_daemon() {
 		--experimental
 		--help
 		--icc=false
+		--init
 		--ip-forward=false
 		--ip-masq=false
 		--iptables=false