fix: Show Passt output on error (#897)

  [[ "$DEBUG" == [Yy1]* ]] && printf "Passt arguments:\n\n%s\n\n" "${PASST_OPTS// -/$'\n-'}"

  if ! $PASST ${PASST_OPTS:+ $PASST_OPTS} >/dev/null 2>&1; then

    local msg="Failed to start passt, reason: $?"

    rm -f "$log"

    PASST_OPTS="${PASST_OPTS/ -q/}"

    { $PASST ${PASST_OPTS:+ $PASST_OPTS}; rc=$?; } || :

    if (( rc != 0 )); then

      [ -f "$log" ] && cat "$log"

    error "$msg"

      error "Failed to start passt, reason: $rc"

      return 1

    fi

  fi

  if [[ "$PASST_DEBUG" == [Yy1]* ]]; then

    tail -fn +0 "$log" --pid=$$ &

  else