GitHub workflows: List open TCP ports

This may help debug nodes that try to open busy ports.

.github/workflows/test-make-target.yaml

@@ -90,6 +90,7 @@ jobs:
     - name: RUN TESTS
       if: inputs.plugin != 'rabbitmq_cli'
       run: |
+        sudo netstat -ntp
         make -C deps/${{ inputs.plugin }} ${{ inputs.make_target }} RABBITMQ_METADATA_STORE=${{ inputs.metadata_store }}
 
     # rabbitmq_cli needs a correct broker version for two of its tests.