The problem was that the Databricks SQL driver does not yet support ARM, which my laptop and Docker container was building for. See ('01000', "[01000] [unixODBC][Driver Manager]Can't open lib '/opt/simba/spark/lib/64/libsparkodbc_sb...

I updated my repo at https://github.com/rlorenzo/databricks_php with a working example and forced the container to build an x86 version.

Will update my repo if Databricks ever supports ARM.

Hope this helps someone in the future.