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The method to duplicate variables from one stage to another in a multi-stage Docker build is to use the --from flag and reference the previous stage's image name or index to copy the needed environment variables. For example:
FROM stage1 AS build
# build stage
FROM stage2
ENV VARIABLE_NAME=value
COPY --from=build /path/to/file /destination/path
# copy file from previous stage and use the environment variable in this stage