services: nar-herder: Add cached compression support.
* gnu/services/guix.scm (<nar-herder-cached-compression-configuration>): New
record type.
(nar-herder-configuration-cached-compressions,
nar-herder-configuration-cached-compression-min-uses,
nar-herder-configuration-cached-compression-workers,
nar-herder-configuration-cached-compression-nar-source,
nar-herder-cached-compression-configuration,
nar-herder-cached-compression-configuration?,
nar-herder-cached-compression-configuration-type,
nar-herder-cached-compression-configuration-level,
nar-herder-cached-compression-configuration-directory,
nar-herder-cached-compression-configuration-directory-max-size): New
procedures.
* doc/guix.texi (Guix Services): Document this.
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