Pre-populate .workspace/port.txt in SonarCloud job to avoid PortAllocation race across parallel test assemblies

Author: tjementum

.github/workflows/code-style.yml

@@ -261,6 +261,14 @@ jobs:
         working-directory: application
         run: npx turbo run build --filter=@repo/emails
 
+      - name: Bootstrap Port Allocation
+        # Pre-populate .workspace/port.txt so the parallel test assemblies in `dotnet test
+        # PlatformPlatform.slnx` don't race PortAllocation.Load(): the loser sees a half-created
+        # zero-byte file and throws "must contain a positive integer. Got: ''".
+        run: |
+          mkdir -p .workspace
+          echo "9000" > .workspace/port.txt
+
       - name: Run SonarCloud Analysis
         working-directory: application
         env: