Default admin site/app pool from deployinfo.txt so deploys stop it

The admin site (public-admin) is built and extracted into RemoteDir on
every deploy, but AdminSiteName/AdminAppPool defaulted to empty, so
deploy-iis-remote-apply.ps1 never stopped it before wiping RemoteDir -
it kept files open under the directory being wiped, causing the
intermittent Access Denied / residual-file failures. Pull the names
from deployinfo.txt (already the local per-environment config file)
so every deploy stops it automatically.

scripts/deploy-iis.ps1

@@ -46,21 +46,39 @@ function Ensure-Command {
   }
 }
 
-function Get-DefaultRemoteTarget {
+# deployinfo.txt (gitignored, local-only) holds one "key value" pair per line, e.g.:
+#   ssh daniel_admin@kci-uluro-web
+#   AdminSiteName PurpleEnvelopes-Admin
+#   AdminAppPool PurpleEnvelopes-Admin
+function Get-DeployInfoValue {
+  param([string]$Key)
   $infoPath = Join-Path $PSScriptRoot 'deployinfo.txt'
   if(!(Test-Path $infoPath)){ return '' }
-  $sshLine = Get-Content $infoPath | Where-Object { $_ -match '^\s*ssh\s+' } | Select-Object -First 1
-  if([string]::IsNullOrWhiteSpace($sshLine)){ return '' }
-  return ($sshLine -replace '^\s*ssh\s+', '').Trim()
+  $pattern = '^\s*' + [regex]::Escape($Key) + '\s+'
+  $line = Get-Content $infoPath | Where-Object { $_ -match $pattern } | Select-Object -First 1
+  if([string]::IsNullOrWhiteSpace($line)){ return '' }
+  return ($line -replace $pattern, '').Trim()
 }
 
 if([string]::IsNullOrWhiteSpace($RemoteTarget)){
-  $RemoteTarget = Get-DefaultRemoteTarget
+  $RemoteTarget = Get-DeployInfoValue 'ssh'
 }
 if([string]::IsNullOrWhiteSpace($RemoteTarget)){
   throw 'No -RemoteTarget given and scripts\deployinfo.txt not found. Create scripts\deployinfo.txt with a line like: ssh user@host'
 }
 
+# The admin site (public-admin) is built and extracted into RemoteDir on every deploy
+# regardless of whether it's stopped first - if its IIS site/app pool name isn't known here,
+# deploy-iis-remote-apply.ps1 can't stop it before wiping RemoteDir, and it'll keep files
+# open under the same directory the wipe is trying to clear. Default from deployinfo.txt so
+# every deploy stops it without needing to pass -AdminSiteName/-AdminAppPool by hand.
+if([string]::IsNullOrWhiteSpace($AdminSiteName)){
+  $AdminSiteName = Get-DeployInfoValue 'AdminSiteName'
+}
+if([string]::IsNullOrWhiteSpace($AdminAppPool)){
+  $AdminAppPool = Get-DeployInfoValue 'AdminAppPool'
+}
+
 Ensure-Command $SshExe
 Ensure-Command $ScpExe
 Ensure-Command git