Update build-installer.yml

Author: mkitchingh

.github/workflows/build-installer.yml

@@ -28,8 +28,9 @@ jobs:
         run: choco install innosetup --yes
 
       - name: Build Installer
+        shell: pwsh
         run: |
-          cmd.exe /c ""C:\Program Files (x86)\Inno Setup 6\ISCC.exe" installer\SmtpRelayInstaller.iss"
+          & "C:\Program Files (x86)\Inno Setup 6\ISCC.exe" "installer\SmtpRelayInstaller.iss"
 
       - name: Upload Final Installer
         uses: actions/upload-artifact@v4