a.md

Dockerfile:

FROM node:18-alpine AS a
RUN echo a > a && chown node: a
USER node

FROM node:18-alpine
COPY --from=a /a /a
RUN cat a

$ docker build -f Dockerfile4 .
...
Step 6/6 : RUN cat a
 ---> Running in 973e91763867
a
Removing intermediate container 973e91763867
 ---> 71a91bf5b1b9
Successfully built 71a91bf5b1b9