Dockerfile COPY relative path

[maowtm]

Currently modus transpile doesn't work fully correctly because it turns out COPY --from=src_image . . in Dockerfile does not respect the WORKDIR property of src_image, and will instead resolve any relative path relative to /.

Example:

FROM alpine AS s1
WORKDIR /tmp
RUN echo hello > hello

FROM alpine
COPY --from=s1 hello hello
RUN cat hello

Step 4/6 : FROM alpine
 ---> c059bfaa849c
Step 5/6 : COPY --from=s1 hello hello
COPY failed: stat hello: file does not exist

[maowtm]

Note that this only affect transpile. Buildkit-based builds work correctly.

[maowtm]

Wontfix: transpile is not a supported feature.