Linux 修改开机启动 boot splash logos

biqu CB1 系统的boot splash logo加载脚本`/etc/initramfs-tools/hooks/bootsplash.sh`
```bash
biqu@BTT-CB1:~$ cat /etc/initramfs-tools/hooks/bootsplash.sh
#!/bin/sh
# Copy splash file to initrd
#
mkdir -p "${DESTDIR}"/lib/firmware
splashfile=/lib/firmware/bootsplash.armbian

if [ -f "${splashfile}" ]; then
        cp "${splashfile}" "${DESTDIR}"/lib/firmware
fi

exit 0
```

使用 [armbian-bootlogo](https://github.com/sdldev/armbian-bootlogo/tree/main) 重新生成一个 `bootsplash.armbian` 文件，需要在 x86-64 的Linux电脑上运行;
```bash
#git clone https://github.com/sdldev/armbian-bootlogo.git
#cd armbian-bootlogo
# ls -l
total 672
-rw-r--r-- 1 root root 601376 Dec 24 13:07 bootsplash.armbian
-rwxr-xr-x 1 root root   4223 Dec 24 13:05 create-bootsplash.sh
-rw-r--r-- 1 root root  26516 Dec 24 13:05 logo.png
-rw-r--r-- 1 root root   1732 Dec 24 13:05 README.md
-rw-r--r-- 1 root root  18707 Dec 24 13:05 spinner.gif

# 替换 logo.png 图片之后执行，在当前目录下生成bootsplash.armbian
# ./create-bootsplash.sh

# 运行下面命令使替换的logo生效
sudo update-initramfs -v -u

```

将 bootsplash.armbian 替换到 /etc/initramfs-tools/hooks/bootsplash.sh路径下