c0879983

By: Tom Sydney Kerckhove <syd@cs-syd.eu>

Use dontInstall instead of a no-op installPhase

The coverage and report derivations populate $out directly in buildPhase, so
the install phase is unnecessary.  Replace the no-op
`installPhase = "runHook preInstall; runHook postInstall"` (which only existed
to suppress stdenv's default `make install`) with the idiomatic
`dontInstall = true`.

Suite timing

Time to Start Worker time Duration Time to finish
Config 0s 7s 7s 7s
Eval 7s 2m31s 2m31s 2m39s
Build 1m22s 5m45s 1m54s 3m16s
Test - - - -
Deploy - - - -
Suite 0s 8m25s 3m16s 3m16s

Timeline

0s20s40s1m1m20s1m40s2m2m20s2m40s3m