openmediavault提示GPG公钥错误解决思路

问题现象：执行apt update时报以下错误

W: GPG error: https://mirrors.tuna.tsinghua.edu.cn/docker-ce/linux/debian bookworm InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7EA0A9C3F273FCD8
E: The repository 'https://mirrors.tuna.tsinghua.edu.cn/docker-ce/linux/debian bookworm InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

1.检查仓库配置

确认Docker的APT源文件（通常位于/etc/apt/sources.list.d/docker.list）是否正确引用了密钥。例如：

deb [signed-by=/usr/share/keyrings/docker.gpg arch=amd64] https://mirrors.tuna.tsinghua.edu.cn/docker-ce/linux/debian bookworm stable

2.根据signed-by路径查看GPG公钥

cd /usr/share/keyrings/

ll命令查看对应gpg文件信息，我这边是对应公钥文件大小为0，所以需要删除重新下载公钥。

3.重新下载或者替换公钥

我这边是重新下载Docker官方GPG密钥，主要保存的文件名称需要跟signed-by路径对应上

curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker.gpg

4.验证

sudo apt update