A passphrase for an SSH private key (as a Systemd credential name), usually provided on generation of the key with rad auth. If set to the default value of null, radicle will optionally import the passphrase from a credential named dev.radicle.node.passphrase. If the passphrase is not set, radicle will prompt for it. If configured as a credential name it will be imported via ImportCredential= in the service configuration. Refer to the systemd-creds documentation for more details https://systemd.io/CREDENTIALS/

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