nixos/pleroma: inject release cookie path to the pleroma package
nixos/pleroma: inject release cookie path to the pleroma package

We inject the release cookie path to the pleroma derivation in order
to wrap pleroma_ctl with it. Doing this allows us to remove the
systemd-injected RELEASE_COOKIE path, which was sadly
buggy (RELEASE_COOKIE should point to the *content* of the cookie, not
the file containing it).

We take advantage of this to factor out the cookie path.

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