Moved installation of dotnet sign to the sign job.

Author: dlemstra

.github/workflows/main.yml

@@ -344,6 +344,9 @@ jobs:
           path: packages
           merge-multiple: true
 
+      - name: Install dotnet sign
+        run: dotnet tool install --global sign --prerelease
+
       - name: Azure CLI login with federated credential
         uses: azure/login@v2
         with:

build/windows/install.dependencies.ps1

@@ -15,6 +15,3 @@ Write-Host "Downloading FFmpeg 4.2.3"
 $sourceFFmpegExe = "https://github.com/dlemstra/Magick.NET.BuildDependencies/releases/download/build-binaries-2025-08-30/ffmpeg-4.2.3-win64.exe"
 $targetFFmpegExe = "c:\vcpkg\ffmpeg.exe"
 Invoke-WebRequest $sourceFFmpegExe -OutFile $targetFFmpegExe
-
-Write-Host "Installing dotnet sign"
-dotnet tool install --global sign --prerelease