Revert "Drop the host flag"

This reverts commit 8bdfe162493ede19175e019e59b4ff725c657a96.

Going to need that to open up the network space outside of the
container. See https://github.com/moby/moby/issues/28121.

ansible/pre-deploy.yml

@@ -48,4 +48,5 @@
         restart: false
         config:
           DOKKU_LETSENCRYPT_EMAIL: "{{ autonomic_admin_mail }}"
+          JEKYLL_HOST: "{{ domain }}"
           JEKYLL_PORT: "{{ http_port }}"

sbin/entrypoint.sh

@@ -8,6 +8,7 @@ run_jekyll() {
 
   bundle exec jekyll serve \
     --port "$JEKYLL_PORT" \
+    --host "$JEKYLL_HOST" \
     --trace
 }