Merge remote-tracking branch 'origin/main'

Author: rcarver

.github/workflows/swift.yml

@@ -12,11 +12,14 @@ on:
 jobs:
   build:
 
-    runs-on: macos-latest
+    runs-on: 
+      - macos-latest
+      - ubuntu-latest
 
     steps:
     - uses: actions/checkout@v3
-    - name: Build
-      run: swift build -v
+    - uses: swift-actions/setup-swift@v1
+      with:
+        swift-version: 5.9
     - name: Run tests
       run: swift test -v