relayhost settings, add ca-certificates package

confd/conf.d/setup_relayhost.toml

@@ -0,0 +1,15 @@
+[template]
+src = "setup_relayhost.tmpl"
+dest = "/start.d/setup_relayhost"
+mode = "0755"
+keys = [
+"/relayhost",
+"/smtp/sasl/auth/enable",
+"/smtp/sasl/password/maps",
+"/smtp/sasl/security/options",
+"/smtp/tls/cafile",
+"/smtp/tls/mandatory/protocols",
+"/smtp/tls/note/starttls/offer",
+"/smtp/tls/security/level",
+"/smtp/tls/session/cache/database"
+]