[NA] fix gemini streaming

apps/opik-backend/src/main/java/com/comet/opik/domain/llmproviders/LlmProviderGemini.java

@@ -7,6 +7,7 @@
 import lombok.RequiredArgsConstructor;
 
 import java.util.Optional;
+import java.util.concurrent.CompletableFuture;
 import java.util.function.Consumer;
 
 @RequiredArgsConstructor
@@ -27,9 +28,9 @@ public ChatCompletionResponse generate(@NonNull ChatCompletionRequest request, @
     public void generateStream(@NonNull ChatCompletionRequest request, @NonNull String workspaceId,
             @NonNull Consumer<ChatCompletionResponse> handleMessage, @NonNull Runnable handleClose,
             @NonNull Consumer<Throwable> handleError) {
-        llmProviderClientGenerator.newGeminiStreamingClient(apiKey, request)
+        CompletableFuture.runAsync(() -> llmProviderClientGenerator.newGeminiStreamingClient(apiKey, request)
                 .generate(request.messages().stream().map(LlmProviderGeminiMapper.INSTANCE::toChatMessage).toList(),
-                        new ChunkedResponseHandler(handleMessage, handleClose, handleError, request.model()));
+                        new ChunkedResponseHandler(handleMessage, handleClose, handleError, request.model())));
     }
 
     @Override

apps/opik-backend/src/test/java/com/comet/opik/api/resources/v1/priv/ChatCompletionsResourceTest.java

@@ -54,6 +54,7 @@
 /// relevant test will be skipped for that provider.
 /// - **Openai**: runs against a demo server and doesn't require an API key
 /// - **Anthropic**: set `ANTHROPIC_API_KEY` to your anthropic api key
+/// - **Gemini**: set `GEMINI_API_KEY` to your gemini api key
 @TestInstance(TestInstance.Lifecycle.PER_CLASS)
 // Disabled because the tests require an API key to run and this seems to be failing in the CI pipeline
 class ChatCompletionsResourceTest {
@@ -227,7 +228,7 @@ private static Stream<Arguments> testModelsProvider() {
                     arguments(AnthropicModelName.CLAUDE_3_5_SONNET_20240620.toString(), LlmProvider.ANTHROPIC,
                             System.getenv("ANTHROPIC_API_KEY")),
                     arguments(GeminiModelName.GEMINI_1_0_PRO.toString(), LlmProvider.GEMINI,
-                            System.getenv("GEMINI_AI_KEY")));
+                            System.getenv("GEMINI_API_KEY")));
         }
 
         @ParameterizedTest