Merge remote-tracking branch 'origin/master'

.github/workflows/ci.yml

@@ -10,6 +10,9 @@ jobs:
     steps:
     - name: Checkout
       uses: actions/checkout@v1
+    - uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: '6.0.x'
     - name: Build
       run: dotnet build
   
@@ -21,6 +24,9 @@ jobs:
     steps:
     - name: Checkout
       uses: actions/checkout@v1
+    - uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: '6.0.x'
     - name: Run tests
       run: dotnet test