Add option to disable webpack dev server livereload

See https://gitlab.com/gitlab-org/gitlab-ce/issues/28204

.gitignore

@@ -27,6 +27,7 @@
 /host
 /port
 /webpack_port
+/webpack_livereload
 /.ruby-version
 /.ruby-gemset
 /localhost.*

Makefile

@@ -14,6 +14,8 @@ username = $(shell whoami)
 sshd_bin = $(shell which sshd)
 git_bin = $(shell which git)
 webpack_port = $(shell cat webpack_port 2>/dev/null || echo '3808')
+# We count any existance as true
+webpack_livereload = $(shell cat webpack_livereload 2>/dev/null || echo 'true')
 all: gitlab-setup gitlab-shell-setup gitlab-workhorse-setup support-setup gitaly-setup
@@ -146,6 +148,7 @@ Procfile:
 		-e "s|/usr/sbin/sshd|${sshd_bin}|"\
 		-e "s|postgres |${postgres_bin_dir}/postgres |"\
 		-e "s|DEV_SERVER_PORT=3808 |DEV_SERVER_PORT=${webpack_port} |"\
+		-e "s|DEV_SERVER_LIVERELOAD=true |DEV_SERVER_LIVERELOAD=${webpack_livereload} |"\
 		$@.example > $@
 	if [ -f .vagrant_enabled ]; then \
 		echo "0.0.0.0" > host; \

Procfile.example

@@ -14,4 +14,4 @@ rails-background-jobs: exec /usr/bin/env SIDEKIQ_LOG_ARGUMENTS=1 RAILS_ENV=devel
 #sshd: exec /usr/sbin/sshd -e -D -f /home/git/openssh/sshd_config
 #nginx: exec nginx -p /home/git/nginx -c conf/nginx.conf
 #gitaly: exec /usr/bin/env GITALY_SOCKET_PATH=/home/git/gitaly.socket GITALY_PROMETHEUS_LISTEN_ADDR=:9101 gitaly/bin/gitaly
-webpack: exec /usr/bin/env NODE_ENV=development DEV_SERVER_PORT=3808 support/exec-cd gitlab npm run dev-server
+webpack: exec /usr/bin/env NODE_ENV=development DEV_SERVER_PORT=3808 DEV_SERVER_LIVERELOAD=true support/exec-cd gitlab npm run dev-server