simulator: Persist beacon logs (#7394)

Beacon logs in the simulator are printed only to stdout. The logs are usually large, so persisting them would be helpful for debugging.


  Added `--log-dir` parameter to the simulators and a step to upload the logs to Artifacts.

(Update)
Added `--disable-stdout-logging` to disable stdout logging, making the CI page cleaner.

.github/workflows/test-suite.yml

@@ -295,8 +295,15 @@ jobs:
       with:
           channel: stable
           cache-target: release
+    - name: Create log dir
+      run: mkdir ${{ runner.temp }}/basic_simulator_logs
     - name: Run a basic beacon chain sim that starts from Deneb
-      run: cargo run --release --bin simulator basic-sim
+      run: cargo run --release --bin simulator basic-sim --disable-stdout-logging --log-dir ${{ runner.temp }}/basic_simulator_logs
+    - name: Upload logs
+      uses: actions/upload-artifact@v4
+      with:
+        name: basic_simulator_logs
+        path: ${{ runner.temp }}/basic_simulator_logs
   fallback-simulator-ubuntu:
     name: fallback-simulator-ubuntu
     needs: [check-labels]
@@ -309,8 +316,15 @@ jobs:
       with:
           channel: stable
           cache-target: release
+    - name: Create log dir
+      run: mkdir ${{ runner.temp }}/fallback_simulator_logs
     - name: Run a beacon chain sim which tests VC fallback behaviour
-      run: cargo run --release --bin simulator fallback-sim
+      run: cargo run --release --bin simulator fallback-sim --disable-stdout-logging --log-dir ${{ runner.temp }}/fallback_simulator_logs
+    - name: Upload logs
+      uses: actions/upload-artifact@v4
+      with:
+        name: fallback_simulator_logs
+        path: ${{ runner.temp }}/fallback_simulator_logs
   execution-engine-integration-ubuntu:
     name: execution-engine-integration-ubuntu
     needs: [check-labels]