Add zsh completion for 'docker {pull,push} --disable-content-trust'

Signed-off-by: Steve Durrheimer <s.durrheimer@gmail.com>
Upstream-commit: dc9d859c15
Component: cli

components/cli/contrib/completion/zsh/_docker

@@ -883,11 +883,13 @@ __docker_subcommand() {
             _arguments $(__docker_arguments) \
                 $opts_help \
                 "($help -a --all-tags)"{-a,--all-tags}"[Download all tagged images]" \
+                "($help)--disable-content-trust[Skip image verification]" \
                 "($help -):name:__docker_search" && ret=0
             ;;
         (push)
             _arguments $(__docker_arguments) \
                 $opts_help \
+                "($help)--disable-content-trust[Skip image signing]" \
                 "($help -): :__docker_images" && ret=0
             ;;
         (rename)