Changelog for v3.15.1

🐛 Bug Fixes

• 13486a0 fix: make EnvironmentFile optional in systemd service to prevent startup failures
• 34e6787 fix: add git repository validation before attempting git operations in installer

🔄 All Changes

• 13486a0 fix: make EnvironmentFile optional in systemd service to prevent startup failures
• 34e6787 fix: add git repository validation before attempting git operations in installer

This patch release resolves critical installation issues that prevented v3.15.0 from installing properly:

1. Systemd Service Fix: The systemd service now treats the .env file as optional, preventing startup failures on fresh installations where the file doesn't exist yet.

2. Git Repository Validation: The installer now properly validates that a directory is a git repository before attempting git operations, preventing "fatal: not a git repository" errors.

These fixes ensure the installation process completes successfully and the service starts properly.