Revert "joystream-node.Dockerfile COPY from all targets"

This reverts commit aa5e9ef95514c672e4ea6ee29f912b86393cb639.

joystream-node.Dockerfile

@@ -21,16 +21,8 @@ FROM debian:buster
 LABEL description="Joystream node"
 WORKDIR /joystream
 COPY --from=builder /joystream/target/release/joystream-node /joystream/node
-COPY --from=builder /joystream/target/release/chain-spec-builder /joystream/chain-spec-builder
 COPY --from=builder /joystream/target/release/wbuild/joystream-node-runtime/joystream_node_runtime.compact.wasm /joystream/runtime.compact.wasm
-
-COPY --from=builder /joystream/target/aarch64-unknown-linux-gnu/release/joystream-node /joystream/node
-COPY --from=builder /joystream/target/aarch64-unknown-linux-gnu/release/chain-spec-builder /joystream/chain-spec-builder
-COPY --from=builder /joystream/target/aarch64-unknown-linux-gnu/release/wbuild/joystream-node-runtime/joystream_node_runtime.compact.wasm /joystream/runtime.compact.wasm
-
-COPY --from=builder /joystream/target/arm-unknown-linux-gnueabihf/release/joystream-node /joystream/node
-COPY --from=builder /joystream/target/arm-unknown-linux-gnueabihf/release/chain-spec-builder /joystream/chain-spec-builder
-COPY --from=builder /joystream/target/arm-unknown-linux-gnueabihf/release/wbuild/joystream-node-runtime/joystream_node_runtime.compact.wasm /joystream/runtime.compact.wasm
+COPY --from=builder /joystream/target/release/chain-spec-builder /joystream/chain-spec-builder
 
 # confirm it works
 RUN /joystream/node --version