[Bug] shippy still uses build slug splitting instead of using regex pattern matching

[sentry-io]

Sentry Issue: SHIPPY-34

ValueError: too many values to unpack (expected 6)
  File "shippy", line 8, in <module>
    sys.exit(main())
  File "shippy/__main__.py", line 400, in main
    search_and_upload_builds(client, args)
  File "shippy/__main__.py", line 108, in search_and_upload_builds
    check_and_upload_build(client, args, build_path)
  File "shippy/__main__.py", line 70, in check_and_upload_build
    if not check_build(client, build_path):
  File "shippy/__main__.py", line 287, in check_build
    _, _, _, build_type, build_variant, _ = build_slug.split("-")