Add github workflow

.github/workflows/test.yml

@@ -0,0 +1,34 @@
+name: Test
+
+on: [push]
+
+jobs:
+  test:
+    name: Test on destination ${{ matrix.configurations.destination }}
+    runs-on: macOS-13
+    strategy:
+      matrix:
+        configurations:
+          - destination: "platform=macOS"
+            scheme: "Fetch-macOS"
+            platform: "macOS"
+
+    steps:
+    - name: Xcode Select
+      run: sudo xcode-select -s /Applications/Xcode_15.0.1.app
+
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    - name: Bundler
+      run: bundle install
+
+    - name: Generate xcode project for code coverage
+      run: swift package generate-xcodeproj --enable-code-coverage
+
+    - name: Run tests on ${{ matrix.configurations.destination }}
+      run: xcodebuild -scheme Config-Package test |
+           xcpretty --report html --output test_output/results.html --report junit --output test_output/unit-tests/results.xml
+
+    - name: Post Coverage
+      run: bundle exec slather