Add in formatting pre-check. (#431)

.github/workflows/dotnet.yaml

@@ -34,6 +34,12 @@ jobs:
         if: matrix.os != 'windows-latest'
         run: |
           rsync --archive --ignore-existing ${DOTNET_ROOT/3.1.201/2.1.805}/ ${DOTNET_ROOT/3.1.201/2.1.202}/ $DOTNET_ROOT
+      - name: Setup Format
+        run: dotnet tool install -g dotnet-format
+      - name: Check Format
+        # don't check formatting on Windows b/c of CRLF issues.
+        if: matrix.os != 'windows-latest'
+        run: dotnet format --check --dry-run --exclude ./src/KubernetesClient/generated/
       - name: Build
         run: dotnet build --configuration Release
       - name: Test