When you create your own APT repo, you have to create a GPG key for it. So you need to import it with:

apt-key add yourkey.asc

or with a key server:

apt-key adv --keyserver keyserver.ubuntu.com --recv 3E5C1192

However, I do not know any update process for this ? When the key will expire, in both case, do we need to import-it again ?

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