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## Problem
For certificate auth, we need to configure pg_hba and pg_ident for it to
work.
HCC needs to mount this config map to all pg compute pod.
## Summary of changes
Create `databricks_pg_hba` and `databricks_pg_ident` to configure where
the files are located on the pod. These configs are pass down to
`compute_ctl`. Compute_ctl uses these config to update `pg_hba.conf` and
`pg_ident.conf` file.
We append `include_if_exists {databricks_pg_hba}` to `pg_hba.conf` and
similarly to `pg_ident.conf`. So that it will refer to databricks config
file without much change to existing pg default config file.
---------
Co-authored-by: Jarupat Jisarojito <jarupat.jisarojito@databricks.com>
Co-authored-by: William Huang <william.huang@databricks.com>
Co-authored-by: HaoyuHuang <haoyu.huang.68@gmail.com>