The image for Cloud Shell is set as gbraad/openstack-client:alpine by default. If you want to use other image, edit CLOUD_SHELL_IMAGE variable in file _0330_cloud_shell_settings.py.sample, and copy it to horizon/openstack_dashboard/local/local_settings.d/_0330_cloud_shell_settings.py, and restart Horizon.
See Configuration Guide in the Horizon documentation.
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