Environment variables suffixed by "_FILE" to set for the cert's service for your selected dnsProvider. To find out what values you need to set, consult the documentation at https://go-acme.github.io/lego/dns/ for the corresponding dnsProvider. This allows to securely pass credential files to lego by leveraging systemd credentials.
Declarations
Type
attribute set of pathDefault
config.security.acme.defaults.credentialFilesExample
{
"RFC2136_TSIG_SECRET_FILE" = "/run/secrets/tsig-secret-example.org";
}