The trust store file needs to be accessible from all nodes in the shared compute cluster. You can achieve this by storing the trust store file in a location that is accessible to all nodes, such as a mounted volume or a distributed file system.

Here's some documentation on Volumes https://docs.databricks.com/en/sql/language-manual/sql-ref-volumes.html 

Make sure the file has sufficient permissions 

#!/bin/bash cp /dbfs/Volumes/test_catalog/oracle_jdbc_driver/certs/oracle_truststore.jks /tmp/oracle_truststore.jks chmod 644 /tmp/oracle_truststore.jks