Diff with v2: Prevents unecessary calls to system*

Please, when review finished, apply against guix-home-wip branch.

Andrew Tropin (4):
  home-services: Add most essential home services
  home-services: Add home-run-on-change-service-type
  home-services: Add home-provenance-service-type
  home-services: Add fold-home-service-types function

 gnu/home-services.scm | 477 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 477 insertions(+)
 create mode 100644 gnu/home-services.scm

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2.32.0