Add Cloudron packaging for Maubot

maubot-src/maubot/lib/optionalalchemy.py

@@ -0,0 +1,19 @@
+try:
+    from sqlalchemy import MetaData, asc, create_engine, desc
+    from sqlalchemy.engine import Engine
+    from sqlalchemy.exc import IntegrityError, OperationalError
+except ImportError:
+
+    class FakeError(Exception):
+        pass
+
+    class FakeType:
+        def __init__(self, *args, **kwargs):
+            raise Exception("SQLAlchemy is not installed")
+
+    def create_engine(*args, **kwargs):
+        raise Exception("SQLAlchemy is not installed")
+
+    MetaData = Engine = FakeType
+    IntegrityError = OperationalError = FakeError
+    asc = desc = lambda a: a