Test chown (#434)

Author: StefanScherer

chown/Dockerfile

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+FROM mcr.microsoft.com/windows/servercore:1809
+RUN net user /add User03 Passw0rd
+COPY test C:/test1
+COPY --chown=User03 test C:/test2
+COPY --chown=ContainerUser test C:/test3
+RUN icacls \test1
+RUN icacls \test2
+RUN icacls \test3

chown/README.md

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+# COPY --chown
+
+Play a little with `COPY --chown=user` on Windows.
+
+See also
+https://github.com/moby/moby/pull/35521
+https://github.com/docker/windows-container-utility

chown/test/README.md

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+# test
+
+Just some test files that will get copied into the container image.

chown/test/hello.txt

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+hello