Add comprehensive backup system for Gitea database

schedule-backup.ps1

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+# Script to create a scheduled task for Gitea database backups
+$scriptPath = Join-Path (Get-Location) "backup-gitea-db.ps1"
+$taskName = "GiteaDatabaseBackup"
+$taskDescription = "Regular backup of Gitea PostgreSQL database"
+
+# Check if the backup script exists
+if (-not (Test-Path $scriptPath)) {
+    Write-Host "Backup script not found at: $scriptPath" -ForegroundColor Red
+    exit 1
+}
+
+# Create a scheduled task to run daily at 3 AM
+$action = New-ScheduledTaskAction -Execute "PowerShell.exe" -Argument "-NoProfile -ExecutionPolicy Bypass -File `"$scriptPath`""
+$trigger = New-ScheduledTaskTrigger -Daily -At 3AM
+$settings = New-ScheduledTaskSettingsSet -StartWhenAvailable -DontStopOnIdleEnd -AllowStartIfOnBatteries -DontStopIfGoingOnBatteries
+
+# Register the scheduled task
+$taskExists = Get-ScheduledTask -TaskName $taskName -ErrorAction SilentlyContinue
+
+if ($taskExists) {
+    Write-Host "Task '$taskName' already exists. Updating..." -ForegroundColor Yellow
+    Set-ScheduledTask -TaskName $taskName -Action $action -Trigger $trigger -Settings $settings -Description $taskDescription
+} else {
+    Write-Host "Creating new scheduled task '$taskName'..." -ForegroundColor Green
+    Register-ScheduledTask -TaskName $taskName -Action $action -Trigger $trigger -Settings $settings -Description $taskDescription -User "$env:USERDOMAIN\$env:USERNAME"
+}
+
+Write-Host "Scheduled task setup complete. The database will be backed up daily at 3 AM." -ForegroundColor Green
+Write-Host "Backup files will be stored in the 'backups' folder in your Gitea Docker directory." -ForegroundColor Green