Moved to using native dotnet commands for CI (#12)

* Moved to using native `dotnet` commands for CI

Until someone gets a chance to troubleshoot FAKE for use with Github Actions

* target .NET Core 2.2.300 

same as `global.json`

* disabling `dotnet test` for now

.github/workflows/build-and-test.yml

@@ -9,7 +9,7 @@ on:
     - '**.csproj'
 
 env:
-  DOTNET_VERSION: '5.0' # The .NET SDK version to use
+  DOTNET_VERSION: '2.2.300' # The .NET SDK version to use
 
 jobs:
   build-and-test:
@@ -18,7 +18,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [windows-latest]
+        os: [windows-latest, ubuntu-latest]
 
     steps:
     - uses: actions/checkout@v2
@@ -27,5 +27,11 @@ jobs:
       with:
         dotnet-version: ${{ env.DOTNET_VERSION }}
 
-    - name: FAKE
-      run: build/fake.cmd default
+    - name: Install dependencies
+      run: dotnet restore
+
+    - name: Build
+      run: dotnet build --configuration Release --no-restore
+
+    #- name: Test
+    #  run: dotnet test --no-restore --verbosity normal