Image

::copy(+src, +dst): Copy file/directory from another image.

Existing files already in the current image will be overwritten in the new layer, and directories will be copied recursively. Any non-existant parent directories will be created.

This is equivalent to COPY --from=src_image in Dockerfile. Following Docker's behavior, if src is a directory, the content of src is copied into dst, but not src itself. This means that copy("dir", "/") is equivalent to cp -r dir/* /, except that hidden files are also copied.

If src is a relative path, it is resolved based on the source image's working directory. If dst is a relative path, it is resolved based on the current image's working directory.
::append_path(+path): append string to the PATH environment variable.
::set_env(+key, +value), ::set_entrypoint(+str_or_array), ::set_cmd(+array), ::set_workdir(+dir), ::set_user(+username), ::set_label(+key, +value): Set image properties.

::set_workdir also allows specifying a relative path based on the input image's working directory. This will be resolved to an absolute path.

::set_entrypoint will clear any command the image has, to be consistent with the ENTRYPOINT command in Dockerfile.

Example:
```
app :-
  (
    from("alpine"),
    copy("./app", "/"),
    copy("./entrypoint.sh", "/")
  )::set_entrypoint("/entrypoint.sh")
   ::set_cmd(["start"])
   ::set_label("org.opencontainers.image.vendor", "Modus").
```