set loopback device alias during build

instead of hardcode

.github/workflows/win-exe.yml

@@ -22,6 +22,8 @@ jobs:
   build-msi:
     name: Build .msi Installer
     runs-on: windows-latest
+    env:
+      LOOPBACK_ALIAS: 'cryptomator-vault'
     steps:
       - uses: actions/checkout@v3
         with:
@@ -105,6 +107,16 @@ jobs:
       - name: Patch Application Directory
         run: |
           cp dist/win/contrib/* appdir/Cryptomator
+      - name: Set LOOPBACK_ALIAS in patchWebDAV.bat
+        shell: pwsh
+        run: |
+          $patchScript = "appdir\Cryptomator\patchWebDAV.bat"
+          try {
+            (Get-Content $patchScript ) -replace '::REPLACE ME', "SET LOOPBACK_ALIAS=`"${{ evn.LOOPBACK_ALIAS}}`"" | Set-Content $patchScript
+          } catch {
+            Write-Host "Failed to set LOOPBACK_ALIAS for patchWebDAV.bat"
+            exit 1
+          }
       - name: Fix permissions
         run: attrib -r appdir/Cryptomator/Cryptomator.exe
         shell: pwsh