The `PATH` env variable gets reset to it's original value by `su`,
because its a "secure" env variable, and is _never_ preserved across
user-switches.
Because of this, the Postgres commands like `initdb` are not found on
the `PATH`. This PR fixes this by setting the `PATH` in the command
passed to `su` itself, so that `initdb` can now be found.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
- **Bug Fixes**
- Improved the initialization process for local Postgres data folder to
ensure compatibility with environment variables.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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