fix(temp_directory): set temp_directory to /tmp

[eoinsha]

Fix for errors such as

{
  "errorMessage": "IO Error: Failed to create directory \".tmp\": Read-only file system",
  "errorType": "QueryError",
}

[Copilot]

Pull Request Overview

This PR fixes errors related to directory creation by explicitly setting the temporary directory to "/tmp" in the database configuration.

• Adds "SET temp_directory='/tmp';" to the query string to mitigate IO errors due to a read-only file system error.
• Updates bootstrap.cpp to ensure proper temporary directory configuration.