Add Ubuntu GitHub workflow

.github/workflows/ubuntu.yml

@@ -0,0 +1,38 @@
+name: ubuntu build & test
+
+# Controls when the action will run. Triggers the workflow on push or pull request
+# events but only for the master branch
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+    - uses: actions/checkout@v4.1.5
+
+    - name: Setup .NET
+      uses: actions/setup-dotnet@v4.0.0
+      with:
+        # DOTNET_VERSION: Update YAML build to use current .NET version.
+        dotnet-version: 8.0.x
+
+    - name: Build everything
+      run: |
+        & .\eng\build.ps1 -build $true
+
+    - name: Run unit tests
+      run: |
+        & .\eng\build.ps1 -build $false -test $true
+
+    - name: Test artifact publishing
+      run: |
+        & .\eng\build.ps1 -build $false -publish $true