copy-tarballs.pl: Revive extracting all tarballs from release.nix

pkgs/top-level/release-lib.nix

@@ -1,4 +1,8 @@
-{ supportedSystems, packageSet ? (import ./all-packages.nix), allowTexliveBuilds ? false }:
+{ supportedSystems
+, packageSet ? (import ./all-packages.nix)
+, allowTexliveBuilds ? false
+, scrubJobs ? true
+}:
 
 with import ../../lib;
 
@@ -14,6 +18,9 @@ rec {
   pkgs = pkgsFor "x86_64-linux";
 
 
+  hydraJob' = if scrubJobs then hydraJob else id;
+
+
   /* !!! Hack: poor man's memoisation function.  Necessary to prevent
      Nixpkgs from being evaluated again and again for every
      job/platform pair. */
@@ -48,7 +55,7 @@ rec {
      a derivation for each supported platform, i.e. ‘{ x86_64-linux =
      f pkgs_x86_64_linux; i686-linux = f pkgs_i686_linux; ... }’. */
   testOn = systems: f: genAttrs
-    (filter (x: elem x supportedSystems) systems) (system: hydraJob (f (pkgsFor system)));
+    (filter (x: elem x supportedSystems) systems) (system: hydraJob' (f (pkgsFor system)));
 
 
   /* Similar to the testOn function, but with an additional