Add DB_SCHEMA support for PostgreSQL connections

[l1monenko]

Summary

This PR adds support for configuring the PostgreSQL schema/search path through an environment variable.

Currently the PostgreSQL connection config uses a hardcoded public search path. This makes it difficult to run the panel in environments where a dedicated PostgreSQL schema is preferred instead of using the default public schema.

Changes

• Added DB_SCHEMA environment variable support for PostgreSQL connections
• Kept public as the default value to preserve current behavior
• No breaking changes for existing installations

Example

DB_CONNECTION=pgsql
DB_SCHEMA=pelican

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📝 Walkthrough

Walkthrough

The PostgreSQL schema can now be selected through the database settings command or DB_SCHEMA, with public remaining the default search path.

Changes

Database configuration

Layer / File(s)	Summary
PostgreSQL schema selection command app/Console/Commands/Environment/DatabaseSettingsCommand.php	The command accepts --schema, prompts for a schema when omitted, stores it in DB_SCHEMA, and uses it when testing the PostgreSQL connection.
Configurable PostgreSQL search path config/database.php	The PostgreSQL search_path setting uses DB_SCHEMA with public as its fallback instead of a hard-coded value.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: adding DB_SCHEMA support for PostgreSQL connections.
Description check	✅ Passed	The description matches the changeset by describing configurable PostgreSQL schema/search_path support with a public default.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@config/database.php`:
- Line 104: Update the temporary PostgreSQL connection construction in
DatabaseSettingsCommand to use the configured DB_SCHEMA value, defaulting
consistently to public, instead of hardcoding search_path to public. Keep the
connection test aligned with the application's database configuration.

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📒 Files selected for processing (1)

• config/database.php

[l1monenko]

I have read the CLA Document and I hereby sign the CLA

[l1monenko]

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