Add: clean-destination input to optionally clear destination folder during IIS deployment

- Introduces a new input to allow cleanup of destination folder while retaining specific files and folders (`appsettings.json`, `web.config`, and `store`).
- Updates error handling for IIS site and app pool stop commands to continue execution on failure.

deploy-iis/action.yml

@@ -22,6 +22,10 @@ inputs:
     description: Elenco di file da escludere dal mirroring (separati da virgola, punto e virgola o newline).
     required: false
     default: appsettings.json
+  clean-destination:
+    description: Se 'true', elimina tutto il contenuto della cartella di destinazione (dopo aver fermato IIS) tranne appsettings.json, web.config e la cartella store.
+    required: false
+    default: 'false'
 
 runs:
   using: composite
@@ -99,15 +103,27 @@ runs:
 
         try {
           & $appcmd stop site "/site.name:$site"
-          if ($LASTEXITCODE -ne 0) { throw "stop site fallito ($LASTEXITCODE)" }
+          if ($LASTEXITCODE -ne 0) {
+            Write-Warning "stop site fallito ($LASTEXITCODE) - si prosegue comunque"
+          } else {
             $siteStopped = $true
+          }
 
           & $appcmd stop apppool "/apppool.name:$appPool"
-          if ($LASTEXITCODE -ne 0) { throw "stop apppool fallito ($LASTEXITCODE)" }
+          if ($LASTEXITCODE -ne 0) {
+            Write-Warning "stop apppool fallito ($LASTEXITCODE) - si prosegue comunque"
+          } else {
             $poolStopped = $true
+          }
 
           New-Item -ItemType Directory -Force -Path $dst | Out-Null
 
+          if ('${{ inputs.clean-destination }}' -eq 'true') {
+            $keepItems = @('appsettings.json', 'web.config', 'store')
+            Get-ChildItem -Path $dst | Where-Object { $_.Name -notin $keepItems } | Remove-Item -Recurse -Force
+            Write-Host "Pulizia destinazione completata (keep: $($keepItems -join ', '))"
+          }
+
           & robocopy @robocopyArgs
           $robocopyExitCode = $LASTEXITCODE
           if ($robocopyExitCode -ge 8) {