alchemist: Allow passing args to alchemist

Without the -- the args get interpreted by cargo.

BUG=none
TEST=BOARD=amd64-generic /mnt/host/depot_tools/bazel run //bazel/portage/bin/alchemist -- --host dump-profile PKGDIR

Change-Id: Idc739f55c6212c161793747a661f26f445f7ef80
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/bazel/+/5110831
Tested-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Matt Stark <msta@google.com>
Commit-Queue: Matt Stark <msta@google.com>
Auto-Submit: Raul Rangel <rrangel@chromium.org>
1 file changed