Expose mastodon streaming api

roles/docker/tasks/services/mastodon.yml

@@ -83,12 +83,18 @@
             - internal_network
           healthcheck:
             # prettier-ignore
+            # FIXME: locahost:4000
             test: ['CMD-SHELL', 'wget -q --spider --proxy=off localhost:4000/api/v1/streaming/health || exit 1']
-          ports:
-            - '127.0.0.1:4000:4000'
+          expose: 4000
           depends_on:
             - db
             - redis
+          environment:
+            VIRTUAL_HOST: "{{ mastodon.domain }}"
+            VIRTUAL_PORT: "4000"
+            VIRTUAL_PATH: "/api/v1/streaming"
+            LETSENCRYPT_HOST: "{{ mastodon.domain }}"
+            LETSENCRYPT_EMAIL: "{{ letsencrypt_email }}"
 
         sidekiq:
           image: "tootsuite/mastodon:{{ mastodon_version }}"