fix(Dockerfile): set correct platform args for the debug-tools

This dockerfile copies binaries produces in the builder stage to the target system.
Selecting the proper debug-tools image's platform prevents cross-platform compile errors.

Signed-off-by: Gyutae Bae <gyutae.bae@navercorp.com>

Author: gyutaeb

images/cilium/Dockerfile

@@ -118,6 +118,7 @@ CMD ["/usr/bin/cilium-dbg"]
 # image, install delve debugger and wrap the cilium-agent binary calls
 # with a script that automatically provisions the debugger on a
 # dedicated port.
+FROM ${CILIUM_BUILDER_IMAGE} AS debug-tools
 FROM release AS debug
 # TARGETOS is an automatic platform ARG enabled by Docker BuildKit.
 ARG TARGETOS
@@ -126,8 +127,8 @@ ARG TARGETARCH
 ARG DEBUG_HOLD
 ENV DEBUG_HOLD=${DEBUG_HOLD}
 COPY --from=builder /tmp/install/${TARGETOS}/${TARGETARCH}/usr/bin/cilium-agent /usr/bin/cilium-agent-bin
-COPY --from=builder /go/bin/dlv /usr/bin/dlv
-COPY --from=builder /out/${TARGETOS}/${TARGETARCH}/bin/debug-wrapper /usr/bin/cilium-agent
+COPY --from=debug-tools /go/bin/dlv /usr/bin/dlv
+COPY --from=debug-tools /out/${TARGETOS}/${TARGETARCH}/bin/debug-wrapper /usr/bin/cilium-agent
 
 # Copy the debug symbols across in case the binaries were stripped
 COPY --from=builder /tmp/debug/${TARGETOS}/${TARGETARCH}/ /usr/lib/debug/