Add Windows portable auto-update from Forgejo continuous releases.

Poll windows-continuous by git SHA, download the matching zip, and apply it in place so friends stay current without manual installs.

Co-authored-by: Cursor <cursoragent@cursor.com>

.github/workflows/windows_release.yml

@@ -105,6 +105,7 @@ jobs:
         shell: pwsh
         env:
           ZIP_NAME: ${{ steps.ver.outputs.zip_name }}
+          ASSET_VER: ${{ steps.ver.outputs.asset_ver }}
         run: |
           $ErrorActionPreference = "Stop"
           $exe = Get-ChildItem -Path . -Recurse -Filter infinipaint.exe |
@@ -115,6 +116,8 @@ jobs:
           Remove-Item -Recurse -Force $outDir -ErrorAction SilentlyContinue
           New-Item -ItemType Directory -Force -Path $outDir | Out-Null
           Copy-Item $exe.FullName (Join-Path $outDir "infinipaint.exe")
+          # Identity file for humans / debugging (app also embeds SHA at compile time).
+          Set-Content -Path (Join-Path $outDir "version.txt") -Value $env:ASSET_VER -Encoding ascii
           $dllDir = Join-Path (Get-Location) "windowsinstall\dlls-x86_64"
           if (Test-Path $dllDir) {
             Copy-Item (Join-Path $dllDir "*.dll") $outDir -ErrorAction SilentlyContinue