ci: setup-dotnet

Author: phnx47

.github/workflows/ci.yml

@@ -18,8 +18,13 @@ jobs:
     steps:
       - name: 🚚 Checkout
         uses: actions/checkout@v3
-      - name: 🛠 Setup .NET Core
+      - name: 🛠 Setup .NET
         uses: actions/setup-dotnet@v2
+        with:
+          dotnet-version: |
+            3.1.x
+            6.0.x
+
       - name: ⚙ Restore
         run: dotnet restore
       - name: 🏭 Build