separate super node instances for different chains need to be within the same process to avoid contention over ipfs repo lock

dockerfiles/super_node/Dockerfile

@@ -37,6 +37,8 @@ ARG USER
 ARG CONFIG_FILE
 ARG EXPOSE_PORT_1
 ARG EXPOSE_PORT_2
+ARG EXPOSE_PORT_3
+ARG EXPOSE_PORT_4
 
 RUN adduser -D 5000 $USER
 USER $USER
@@ -54,5 +56,7 @@ COPY --from=builder /go/src/github.com/ipfs/go-ipfs/ipfs ipfs
 
 EXPOSE $EXPOSE_PORT_1
 EXPOSE $EXPOSE_PORT_2
+EXPOSE $EXPOSE_PORT_3
+EXPOSE $EXPOSE_PORT_4
 
 CMD ["./startup_script.sh"]