added secret key

outline/outline-secret.json

@@ -5,6 +5,7 @@
         "POSTGRES_PASSWORD": "#DB_PASSWORD"
     },
     "outlineapp": {
+        "SECRET_KEY": "#SECRET_KEY",
         "DATABASE_URL": "postgres://#DB_USER:#DB_PASSWORD@outlinepostgres-db:5432/#DB_NAME"
     }
 }

outline/template.json

@@ -1,6 +1,13 @@
 {
     "name": "outline",
     "fields": [
+        {
+            "description": "Secret key",
+            "key": "SECRET_KEY",
+            "value": "",
+            "required": "true",
+            "generated": "random|md5|12"
+        },
         {
             "description": "Postgres database name",
             "key": "DB_NAME",