feat(chat): join users to rooms on sign-in

infrastructure/matrix/element/config.json.tmpl

@@ -0,0 +1,18 @@
+{
+  "default_server_config": {
+    "m.homeserver": {
+      "base_url": "${MATRIX_PUBLIC_BASEURL}",
+      "server_name": "${MATRIX_SERVER_NAME}"
+    }
+  },
+  "brand": "EDR Chat",
+  "permalink_prefix": "${ELEMENT_PUBLIC_URL}",
+  "disable_guests": true,
+  "disable_3pid_login": true,
+  "disable_custom_urls": true,
+  "default_theme": "light",
+  "mobile_guide_toast": false,
+  "settingDefaults": {
+    "UIFeature.registration": false
+  }
+}