Update dotnet.yml: Setup .NET with multiple SDK versions

Author: raman-m

.github/workflows/dotnet.yml

@@ -11,15 +11,19 @@ on:
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        dotnet-version: [ '8.0.x', '9.0.x' ]
 
     steps:
     - uses: actions/checkout@v4
-    - name: Setup .NET
-      uses: actions/setup-dotnet@v4
+    - name: Setup .NET ${{ matrix.dotnet-version }}
+      uses: actions/setup-dotnet@v3
       with:
-        dotnet-version: 9.0.x
+        dotnet-version: ${{ matrix.dotnet-version }}
+    - name: Display dotnet version
+      run: dotnet --version
     - name: Restore dependencies
       run: dotnet restore ./Ocelot.sln
     - name: Build