gazelle rule: allow appending args instead of replacing with -args (#337)
gazelle rule: allow appending args instead of replacing with -args (#337)

With this change, users can run the gazelle wrapper script with a
-args argument. The following arguments will be appended to the
baked-in argument list instead of replacing it. This is useful for
running gazelle in specific directories.
bazelbuild/bazel-gazelle,bazelbuild/bazel-gazelle