[FEAT] Add ability to download log files from ray-cluster (Eventual-Inc#3406)

# Overview
- when submitting the job to the ray cluster, the extra
`DAFT_ENABLE_RAY_TRACING` env-var is set to `"1"`
- this will produce custom daft logs
- these log files are rsync'd down from the ray cluster, packaged up,
and sent back to the GHA Summary Page (from where they can be downloaded
by the user)

## Notes
When running the job on the ray-cluster, daft logs are *not* being
generated. Only ray logs are being generated. This is something that
will need to be investigated and resolved later.

For now, will request to have it merged, since everything else still
works (we can still grab ray logs, which is quite useful in and of
itself).

Author: Raunak Bhagat

.github/workflows/run-cluster.yaml

@@ -78,9 +78,34 @@ jobs:
           echo 'Invalid command submitted; command cannot be empty'
           exit 1
         fi
-        ray job submit --working-dir ${{ inputs.working_dir }} --address http://localhost:8265 -- ${{ inputs.command }}
+        ray job submit \
+          --working-dir ${{ inputs.working_dir }} \
+          --address http://localhost:8265 \
+          --runtime-env-json '{"DAFT_RUNNER": "ray", "DAFT_ENABLE_RAY_TRACING": "1"}' \
+          -- ${{ inputs.command }}
+    - name: Download log files from ray cluster
+      run: |
+        source .venv/bin/activate
+        ray rsync-down .github/assets/benchmarking_ray_config.yaml /tmp/ray/session_*/logs ray-daft-logs
+    - name: Kill connection to ray cluster
+      run: |
+        PID=$(lsof -t -i:8265)
+        if [[ -n "$PID" ]]; then
+            echo "Process $PID is listening on port 8265; killing it..."
+            kill -9 "$PID"
+            if [[ $? -eq 0 ]]; then
+                echo "Process $PID killed successfully"
+            else
+                echo "Failed to kill process $PID"
+            fi
+        fi
     - name: Spin down ray cluster
       if: always()
       run: |
         source .venv/bin/activate
         ray down .github/assets/benchmarking_ray_config.yaml -y
+    - name: Upload log files
+      uses: actions/upload-artifact@v4
+      with:
+        name: ray-daft-logs
+        path: ray-daft-logs