add email_template

CloudronManifest.json

@@ -44,8 +44,17 @@
     "https://screenshots.cloudron.io/org.matrix.synapse/2.png",
     "https://screenshots.cloudron.io/org.matrix.synapse/3.png"
   ],
+  "checklist": {
+    "configure-federation": {
+      "message": "For federation to work, the delegation URI `https://$CLOUDRON-APP-DOMAIN/.well-known/matrix/server` must be configured. See the [docs](https://docs.cloudron.io/apps/synapse/#post-installation) on how to do this."
+    },
+    "registration-enabled-without-verification": {
+      "message": "Registration is enabled but verification is disabled. See [docs](https://element-hq.github.io/synapse/latest/usage/configuration/config_documentation.html?highlight=registration_require#enable_registration) for more information",
+      "sso": false
+    }
+  },
   "postInstallMessage": "file://POSTINSTALL.md",
-  "minBoxVersion": "7.5.1",
+  "minBoxVersion": "8.2.0",
   "forumUrl": "https://forum.cloudron.io/category/50/matrix-synapse-riot",
   "documentationUrl": "https://docs.cloudron.io/apps/synapse/",
   "optionalSso": true