update build.sh, add firmware in rootfs

guowenxue

2021-12-29 f7a146878596312f233d4866732e05e68108daf3

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ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=0
update_config=1
 
network={
    scan_ssid=1
    ssid=""
    psk=""
}