Add integration tests workflow

Author: jcansdale

.github/workflows/integration-tests.yml

@@ -0,0 +1,28 @@
+name: Integration tests
+
+on:
+  push:
+
+env:
+  config: Release
+
+jobs:
+  integration-tests:
+    runs-on: windows-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Setup .NET Core
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: 3.1.101
+
+    - name: Build using .NET Core
+      run: dotnet build Octokit.GraphQL.sln -c ${{ env.config }}
+
+    - name: Run integration tests
+      run: dotnet test -c ${{ env.config }} --no-build /p:CollectCoverage=true /p:CoverletOutputFormat=opencover /p:Exclude="[Octokit.GraphQL]Octokit.GraphQL.*" .\Octokit.GraphQL.IntegrationTests\Octokit.GraphQL.IntegrationTests.csproj
+      env:
+        OCTOKIT_GQL_OAUTHTOKEN: "${{ secrets.OCTOKIT_GQL_OAUTHTOKEN }}"
+        OCTOKIT_GQL_GITHUBUSERNAME: "${{ secrets.OCTOKIT_GQL_GITHUBUSERNAME }}"