Run AI tests in CI too

Author: kzu

.github/workflows/build.yml

@@ -72,6 +72,9 @@ jobs:
         run: dotnet build -m:1 -bl:build.binlog
 
       - name: 🧪 test
+        env: 
+          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
+          XAI_API_KEY: ${{ secrets.XAI_API_KEY }}
         run: |
           dotnet tool update -g dotnet-retest
           dotnet retest -- --no-build

src/Tests/OpenAITests.cs

@@ -142,7 +142,6 @@ public async Task GPT5_ThinkingTime(ReasoningEffort effort, string modelId = "gp
 
         var options = new ChatOptions
         {
-            ModelId = "gpt-5",
             ReasoningEffort = effort
         };