feat(values): adding a custom secret for default custom connection

kustomization.yaml

@@ -40,3 +40,10 @@ helmCharts:
     dags:
       gitSync:
         enabled: false
+    secret:
+    - envName: "AIRFLOW_CONN_CUSTOM"
+      secretName: "custom-connection"
+      secretKey: "AIRFLOW_CONN_CUSTOM"
+    extraSecrets:
+      custom-connection:
+        data: "AIRFLOW_CONN_CUSTOM: 'my-conn-type://login:password@host:port/schema?param1=val1&param2=val2'"