[smoke test] Implement --force-repo to override any previous setup

Change-Id: If59fe449ec1afb51aa3ca6eb47fb29616ea3a5e3
Reviewed-on: https://fuchsia-review.googlesource.com/c/sdk-samples/drivers/+/778723
Fuchsia-Auto-Submit: Wayne Piekarski <waynepie@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
Reviewed-by: Renato Mangini Dias <mangini@google.com>
diff --git a/scripts/smoke_test.sh b/scripts/smoke_test.sh
index acb9d1f..fe84490 100755
--- a/scripts/smoke_test.sh
+++ b/scripts/smoke_test.sh
@@ -80,7 +80,7 @@
   pb_name="workstation_eng.qemu-x64"
 
   # fetch an emulator image of workstation and start an emulator
-  print_and_run tools/ffx product-bundle get "$pb_name" --repository "$repo_name"
+  print_and_run tools/ffx product-bundle get "$pb_name" --repository "$repo_name" --force-repo
   stop_emu
 
   emu_options=""