Add utf8mb4 unicode option to mysql config in local.py

docker/conf/local.py

@@ -17,6 +17,9 @@ DATABASES["default"] = {
     "PASSWORD": os.environ.get("AA_DB_PASSWORD"),
     "HOST": os.environ.get("AA_DB_HOST"),
     "PORT": os.environ.get("AA_DB_PORT", "3306"),
+    "OPTIONS": {
+        "charset": os.environ.get("AA_DB_CHARSET", "utf8mb4")
+    }
 }
 
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