Persist secret key in data folder (#620)

* Persist secret key in data folder

* use random secret key by default in prod

* fix e2e test

bookmarks/management/commands/generate_secret_key.py

@@ -0,0 +1,24 @@
+import logging
+import os
+
+from django.core.management.base import BaseCommand
+from django.core.management.utils import get_random_secret_key
+
+
+logger = logging.getLogger(__name__)
+
+
+class Command(BaseCommand):
+    help = "Generate secret key file if it does not exist"
+
+    def handle(self, *args, **options):
+        secret_key_file = os.path.join("data", "secretkey.txt")
+
+        if os.path.exists(secret_key_file):
+            logger.info(f"Secret key file already exists")
+            return
+
+        secret_key = get_random_secret_key()
+        with open(secret_key_file, "w") as f:
+            f.write(secret_key)
+        logger.info(f"Generated secret key file")