nixos/acme: support "full.pem" (for lighttpd)
nixos/acme: support "full.pem" (for lighttpd)

* Create "full.pem" from selfsigned certificate
* Tell simp_le to create "full.pem"
* Inject service dependency between lighttpd and the generation of certificates

Side note: According to the internet these servers also use the
"full.pem" format: pound, ejabberd, pure-ftpd.

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