Improve error handling in Test 3 by capturing and displaying scan output on failure

Author: PaulFirs

.github/workflows/test.yml

@@ -46,12 +46,12 @@ jobs:
           nohup JLinkRemoteServer -select usb=$serial -device STM32F103RE -endian little -speed 4000 -if swd > remote_server.log 2>&1 &
           sleep 3
           bmlab-scan --network 127.0.0.1/32 | tee scan3.txt
-          status=$?
           cat remote_server.log
           grep -q "Target:  *STM32F103RE" scan3.txt
           grep -q "Serial: *$serial" scan3.txt
-          exit $status
-          
+          if [ $? -ne 0 ]; then
+            cat scan3.txt
+          fi
 
       - name: Test 4 — bmlab-scan --network 127.0.0.1/32 -p jlink
         run: |