Update 01_setup_datapusher.sh

[saleemalharir1]

Fix CKAN crash on startup when using DataPusher plugin

CKAN was failing to start when the datapusher plugin was enabled because the startup script (01_setup_datapusher.sh) attempted to generate an API token for the plugin before the sysadmin user had been created.

The original script assumed that the user specified by $CKAN_SYSADMIN_NAME already existed, and used that user to create a token for ckan.datapusher.api_token. On fresh installations, this user may not yet exist, causing the token generation to fail and CKAN to crash with:

Exception: Config option `ckan.datapusher.api_token` must be set to use the DataPusher.

This commit updates the script to:

• Check if the sysadmin user exists using ckan user show
• If not, create the user using ckan sysadmin add --force
• Retry up to 10 times if the CKAN service is not ready yet
• Generate the DataPusher token only after the user exists
• Apply the token to the config using ckan config-tool

This makes the startup script more robust and ensures CKAN can successfully initialize with the DataPusher plugin enabled, even on a clean setup.

[saleemalharir1]

@kowh-ai can you please review the changes and accept it
since i don't want to maintain a fork of the official repo
thanks