chore: Add dotnet setup for running tests (#48)

Author: jsonbailey

.github/actions/ci/action.yml

@@ -8,6 +8,13 @@ inputs:
 runs:
   using: composite
   steps:
+    - name: Setup dotnet build tools
+      uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: |
+          6.0
+          7.0
+
     - run: dotnet --version
       shell: bash