Write deploy manifest without BOM

scripts/deploy-nas.ps1

@@ -75,13 +75,15 @@ if (Test-Path $releaseManifestPath -PathType Leaf) {
   }
 }
 if ($writeReleaseManifest) {
-  @{
+  $releaseManifestJson = @{
     app = "heros_web"
     commit = $fullCommit
     shortCommit = $commit
     qaVersion = $qaVersion
     generatedAt = (Get-Date).ToUniversalTime().ToString("o")
-  } | ConvertTo-Json -Depth 4 | Set-Content -LiteralPath $releaseManifestPath -Encoding UTF8
+  } | ConvertTo-Json -Depth 4
+  $utf8NoBom = New-Object System.Text.UTF8Encoding $false
+  [System.IO.File]::WriteAllText($releaseManifestPath, "$releaseManifestJson`n", $utf8NoBom)
   Write-Host "Wrote $releaseManifestPath for $commit ($qaVersion)"
 }