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FROM alpine AS common
RUN echo "common" > /common.txt
FROM common AS buildA
RUN echo "foo" > /foo.txt
FROM common AS buildB
# This is contrived to force a cached layer without having to build twice
# Ordinarily you wouldn't have duplicate stages
RUN echo "foo" > /foo.txt
FROM alpine
ARG NONCE
RUN --mount=type=bind,from=buildA,target=/buildA \
--mount=type=bind,from=buildB,target=/buildB \
set -ex; \
cat /buildA/common.txt; \
cat /buildA/foo.txt; \
cat /buildB/common.txt; \
cat /buildB/foo.txt; \
echo "Worked"; \
: ;
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