play-routes.bzl: use run() with use_default_shell_env to have access … (

#50)

* play-routes.bzl: use run() with use_default_shell_env to have access to shell

When running on Nix we do not have access to default shell env if this
parameter is not set, thus failing root compilation.

* Remove spawn_strategy and genrule_strategy setting on CI from .bazelrc

This was causing failures after enabling use_default_shell_env in play_routes
rule.

* Revert "Remove spawn_strategy and genrule_strategy setting on CI from .bazelrc"

This reverts commit 2c49ee0.

play-routes/play-routes.bzl

@@ -57,6 +57,7 @@ def _impl(ctx):
         ctx.executable.play_routes_compiler.path,
     ] + args,
     progress_message = "Compiling play routes",
+    use_default_shell_env = True,
     executable = ctx.executable._play_route_helper,
     tools = [ctx.executable.play_routes_compiler, ctx.executable._zipper]
   )