Diagnose CI problems

Author: dabrahams

.github/workflows/ci.yml

@@ -14,11 +14,11 @@ jobs:
       fail-fast: false
       matrix:
         os: [macos-15, ubuntu-24.04, windows-2025]
-    
+
     steps:
     - name: Checkout code
       uses: actions/checkout@v4
-    
+
     - name: Set up swift
       uses: SwiftyLab/setup-swift@latest
       with:
@@ -32,5 +32,8 @@ jobs:
         restore-keys: |
           ${{ runner.os }}-spm-
 
+    - name: Build
+      run: swift build --build-tests --disable-xctest
+
     - name: Run tests
-      run: swift test --disable-xctest
+      run: swift test --skip-update --skip-build --verbose --disable-xctest