Add a role for Jitsi in Docker Compose

We need this role to follow the recommended deployment approach from https://jitsi.github.io/handbook/docs/devops-guide/devops-guide-docker/

This role enables us to keep our config and customizations separate from releases of the Compose setup the Jitsi project publishs.

roles/jitsi/meta/argument_specs.yaml

@@ -0,0 +1,57 @@
+argument_specs:
+  main:
+    options:
+      jitsi__version:
+        type: str
+        required: true
+      jitsi__domain:
+        type: str
+        required: true
+      jitsi__letsencrypt_email:
+        type: str
+        required: true
+      jitsi__jicofo_auth_password:
+        type: str
+        required: true
+        no_log: true
+      jitsi__jvb_auth_password:
+        type: str
+        required: true
+        no_log: true
+      jitsi__timezone:
+        type: str
+        required: false
+        default: Europe/Berlin
+      jitsi__jvb_advertise_ips:
+        type: list
+        elements: str
+        required: false
+        default: [ ]
+      jitsi__whiteboard:
+        type: bool
+        required: false
+        default: false
+      jitsi__turn:
+        type: bool
+        required: false
+        default: false
+      jitsi__turn_secret:
+        type: str
+        required: false
+        no_log: true
+      jitsi__prometheus_exporter:
+        type: bool
+        required: false
+        default: false
+      jitsi__env:
+        type: dict
+        required: false
+        default: { }
+      jitsi__custom_config_js:
+        type: str
+        required: false
+        default: ""
+      jitsi__custom_interface_config_js:
+        type: str
+        required: false
+        default: ""

roles/jitsi/meta/main.yaml

@@ -0,0 +1,4 @@
+---
+allow_duplicates: false
+dependencies:
+  - role: docker