Fix docker build

Author: zguesmi

testchains/nethermind.dockerfile

@@ -79,7 +79,6 @@ RUN if [ "${CHAIN_TYPE}" = "native" ] ; \
 FROM iexechub/nethermind:1.14.1-patch.0
 
 COPY --from=builder /nethermind /nethermind
-COPY --from=builder /iexec-poco/build /build
 
 ###
 ## Configure entrypoint