fix(hicn.yaml): specify architecture in functest trigger

This prevents the functional tests for x86_64 to start when
the build job for aarch64 completes. Since the success message
triggering the functional test was the same for x86_64 and aarch64,
there was no way to distinguish what build jobs completed first.

Also:
  Archive *.deb artifacts to be reused in functest jobs, thus avoiding
  to compile the code twice.

Change-Id: Ibef007eabd57ff417aff1a55e949c11e2e2d9d6a
Signed-off-by: Mauro Sardara <msardara@cisco.com>