libgit2sharp.yml: split build and test

Author: lytico

.github/workflows/libgit2sharp.yml

@@ -23,5 +23,22 @@ jobs:
       run: dotnet restore LibGit2Sharp.sln
     - name: Build
       run: dotnet build --no-restore LibGit2Sharp.sln
+      
+  test:
+    runs-on: ubuntu-20.04
+
+    steps:
+    - uses: actions/checkout@v2
+      with:
+          fetch-depth: 0
+    - name: Setup .NET
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: 3.1.401
+    - name: Restore dependencies
+      run: dotnet restore LibGit2Sharp.sln
+    - name: Build
+      run: dotnet build --no-restore LibGit2Sharp.sln
+      
     - name: Test
       run: dotnet test --no-build --verbosity normal LibGit2Sharp.sln