This corrects the PATH in debug images.
This corrects the PATH in debug images.

Omitting PATH seems to make Docker default to a typical value, but when we add `busybox` we block this.

This gives `//base` the typical value, and makes `//base:debug` extend it to include `/busybox`.

GoogleContainerTools/distroless,istio/distroless,istio/distroless,istio/distroless,GoogleContainerTools/distroless,GoogleContainerTools/distroless