feat: Adding FORCE_SSL as feature flag in config.py (#14934)

superset/config.py

@@ -383,6 +383,9 @@ DEFAULT_FEATURE_FLAGS: Dict[str, bool] = {
     # for report with type 'report' still send with email and slack message with
     # screenshot and link
     "ALERTS_ATTACH_REPORTS": True,
+    # Enabling FORCE_DATABASE_CONNECTIONS_SSL forces all database connections to be
+    # encrypted before being saved into superset metastore.
+    "FORCE_DATABASE_CONNECTIONS_SSL": False,
 }
 
 # Feature flags may also be set via 'SUPERSET_FEATURE_' prefixed environment vars.