fix ci tracing tests silently failing

Signed-off-by: Doru Blânzeanu <[email protected]>

Author: dblnz

Justfile

@@ -205,9 +205,9 @@ test-rust-tracing target=default-target features="":
     just move-rust-guests {{ target }}
     # Run hello-world example with tracing enabled to get the trace output
     # Capture the trace file path and print use it afterwards to run cargo run -p trace_dump
-    cargo run --profile={{ if target == "debug" { "dev" } else { target } }} --example hello-world --features {{ if features =="" {'trace_guest'} else { "trace_guest," + features } }} \
-        | sed -n 's/.*Creating trace file at: \(.*\)/\1/p' \
-        | xargs -I {} cargo run -p trace_dump ./{{ simpleguest_source }}/{{ target }}/simpleguest {} list_frames
+    OUTPUT=$(cargo run --profile={{ if target == "debug" { "dev" } else { target } }} --example hello-world --features {{ if features =="" {'trace_guest'} else { "trace_guest," + features } }}) && \
+        FILE=$(echo $OUTPUT | sed -n 's/.*Creating trace file at: \(.*\)/\1/p') && \
+        cargo run -p trace_dump ./{{ simpleguest_source }}/{{ target }}/simpleguest $FILE list_frames
 
     # Rebuild the tracing guests without the tracing feature
     # This is to ensure that the tracing feature does not affect the other tests