docs: call out ONBUILD COPY --from as unsupported

Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>
moby · Mar 27, 2024 · c0b3994 · c0b3994
1 parent 7a53b4b
commit c0b3994
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/frontend/dockerfile/docs/reference.md b/frontend/dockerfile/docs/reference.md
@@ -1472,6 +1472,10 @@ By default, the `COPY` instruction copies files from the build context. The
 COPY [--from=<stage|image>] <src> ... <dest>
 ```
 
+> **Note**
+>
+> `ONBUILD COPY --from` is not supported.
+
 To copy from a build stage in a
 [multi-stage build](https://docs.docker.com/build/building/multi-stage/),
 specify the name of the stage you want to copy from. You specify stage names