title: GCP Airflow connection by using secret manager
body: <p>I am trying to add Airflow connection for GCP cloud(SA key should be fetched from secret manager) but in my Airflow UI(version 2.1.4) i couldnt find option for adding by using secret manager. is it because of version problem?
  <a href="https://i.stack.imgur.com/MLcr2.png" rel="nofollow noreferrer">enter image description here</a></p>
  <p>if so can we add the airflow connection (by using secret manager) via command line(gcloud) or via programmatically to add it</p>
  <p>I tried via command line but it throws below error:</p>
  <p>gcloud composer environments run project_id --location europe-west2 connections add --  edw_test    --conn-type=google_cloud_platform    --conn-extra '{&quot;extra__google_cloud_platform__project&quot;: &quot;proejct&quot;, &quot;extra__google_cloud_platform__key_secret_name&quot;: &quot;test_edw&quot;,&quot;extra__google_cloud_platform__scope&quot;: &quot;https://www.googleapis.com/auth/cloud-platform&quot;}'
  kubeconfig entry generated for europe-west2--902058d8-gke.
  Unable to connect to the server: dial tcp 172.16.10.2:443: i/o timeout
  ERROR: (gcloud.composer.environments.run) kubectl returned non-zero status code.</p>