By default there is a fixed keyring in /usr or /etc. But when running systemd-pull unprivileged in the user context or with a custom transfer definition as in systemd-sysupdate --definitions=./... (e.g., for local ParticleOS updates) it is limiting to require that all keys have to be part of the OS keyring or otherwise no verification can be used. Also, for testing it is valuable to point it at a different keyring. Add a SYSTEMD_OPENPGP_KEYRING env var where the omission or empty assignment sticks to the current behavior of the global OS keyrings but a keyring path given will take precedence. While an env var can leak down the process tree and is more difficult to secure for being the trust anchor the advantage is that one can directly specify it in the service unit as drop-in instead of having to patch the command invocation. Anyway it's a niche use case and thus not part of the man page.
System and Service Manager
Details
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