Adding unit test for ephemeral feature flag

This was something that was missing in #707.
Adding a new test to make sure the ephemeral feature flag from upstream
is set up correctly by the script.

test/entrypoint/should_work_normally/test.sh

@@ -55,9 +55,15 @@ if [ ${count} != "1" ]; then
   error "The configuration step was not run exactly once"
   exit 1
 fi
-
 success "The configuration ran ${count} time(s)"
 
+log "Testing if the configuration included the --ephemeral flag"
+if grep -q -- '--ephemeral' ${RUNNER_HOME}/runner_config; then
+  error "==============================================="
+  error "The configuration should not include the --ephemeral flag"
+  exit 1
+fi
+
 log "Testing if runsvc ran"
 if [ ! -f "${RUNNER_HOME}/runsvc_ran" ]; then
   error "=============================="