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Issue description: 

 Clarify that WORKDIR is NOT preserved between multistages

Example:
~~~
FROM registry.access.redhat.com/ubi9/ubi:9.5 AS first
WORKDIR /opt
RUN pwd # == /opt
RUN echo test > test.txt # is saved on /opt/test.txt

FROM registry.access.redhat.com/ubi9/ubi:9.5
RUN pwd # == “/” That is, WORKDIR is NOT preserved between multistages, but “starts” again form default “/”

1. COPY --from=first test.txt /opt/test.txt # WRONG The file on the left would be searched from the “new” WORKDIR, that is in /test.txt
   COPY --from=first /opt/test.txt /opt/test.txt # CORRECT
   ENTRYPOINT ["sleep"]
   CMD ["infinity"]

Steps to reproduce:

Workaround:

Expected result: