Add .NET SDK setup to CI/release workflows

windows-latest may not have .NET 8/9/10 pre-installed,
so explicitly set up all required SDKs for multi-targeting.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: xrkolovos

.github/workflows/ci.yml

@@ -17,6 +17,13 @@ jobs:
       uses: actions/checkout@v4
       with:
         fetch-depth: 0
+    - name: Setup .NET SDKs
+      uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: |
+          8.0.x
+          9.0.x
+          10.0.x
     - name: Build and Test
       run: ./Build.ps1
       shell: pwsh

.github/workflows/release.yml

@@ -13,7 +13,14 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v4
       with:
-        fetch-depth: 0        
+        fetch-depth: 0
+    - name: Setup .NET SDKs
+      uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: |
+          8.0.x
+          9.0.x
+          10.0.x
     - name: Build and Test
       run: ./Build.ps1
       shell: pwsh