🐳 pottwal: Add prosody docker container

The service should be moved away from helium.n39.eu into a container.

pottwal.yml

@@ -12,6 +12,8 @@
     shlink_host_port: 8083
     shlink_domain_name: sl.n39.eu
 
+    prosody_data: "{{ data_dir }}/prosody"
+
     hedgedoc_host_port: 8084
     hedgedoc_image: quay.io/hedgedoc/hedgedoc:1.9.3
 
@@ -119,6 +121,25 @@
         site_name: "{{ shlink_domain_name }}"
         proxy_port: "{{ shlink_host_port }}"
 
+    - name: Ensure container for prosody XMPP server is running
+      docker_container:
+        name: prosody
+        image: netz39/prosody:0.11
+        pull: true
+        state: started
+        detach: true
+        restart_policy: unless-stopped
+        ports:
+          # container offers more ports, depends on actual prosody configuration
+          - 5222:5222   # xmpp-client
+          - 5269:5269   # xmpp-server
+        volumes:
+          - "{{ prosody_data }}/etc/prosody:/etc/prosody:rw"
+          - "{{ prosody_data }}/var/lib/prosody:/var/lib/prosody:rw"
+          - "{{ prosody_data }}/var/log/prosody:/var/log/prosody:rw"
+          # TODO  Migrate to dehydrated role
+          # - /var/lib/dehydrated:/var/lib/dehydrated:ro
+
     - name: Check if hedgedoc data dir exists
       ansible.builtin.stat:
         path: "{{ data_dir }}/hedgedoc"