Enable copying symlinks when using remote docker. #885
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This handles the reads the link dst from the symlink when using temporary directories, and creates a softlink to the path (keeping relative and absolute symlinks valid) in the temporary directory, which is then copied with the same permissions over the dst filesystem. This should not keep the same metadata, but since we fingerprint source files, this should not matter.
If symlinks are created, it issues a warning that there might be bugs that the file pointed to by the symlink is not mounted and the build may fail in that case.