Error in string substitution.

[wpoosanguansit]

Hi,

Thank you for having this dockerfile. I am trying to use it to bring up testnet instances. However, the script does not run as mentioned in the README. I am getting these when run:

Sending build context to Docker daemon 242.2kB
Step 1/29 : FROM ubuntu:bionic
---> cf0f3ca922e0
Step 2/29 : LABEL MAINTAINER Kyle O <kyleo[at]0b10[dot]mx>
---> Using cache
---> 64649dc0c596
Step 3/29 : LABEL description="Build or rebuild and run the IOHK Cardano rust node -- https://github.com/input-output-hk/jormungandr "
---> Using cache
---> 3f77437d940e
Step 4/29 : ARG PREFIX=/woo
---> Using cache
---> 6bdb9f9395b7
Step 5/29 : ENV ENV_PREFIX=${PREFIX}
---> Using cache
---> 08c4fb9b4d6c
Step 6/29 : ARG BRANCH=master
---> Using cache
---> c75e47b6e483
Step 7/29 : ENV ENV_BRANCH=${BRANCH}
---> Using cache
---> 432e6480ee9b
Step 8/29 : RUN apt-get update && apt-get install -y build-essential pkg-config git curl libssl-dev bash telnet netcat-openbsd tcpdump net-tools && apt-get clean && rm -rf /var/lib/apt/lists/*
---> Using cache
---> aec8ec3ce76a
Step 9/29 : RUN curl https://sh.rustup.rs -sSf | bash -s -- -y && /bin/bash -c "source $HOME/.cargo/env;rustup install stable;rustup default stable"
---> Using cache
---> afc612efc764
Step 10/29 : RUN mkdir -p ${ENV_PREFIX}/src ${ENV_PREFIX}/bin ${ENV_PREFIX}/log ${ENV_PREFIX}/etc/cert ${ENV_PREFIX}/etc/key ${ENV_PREFIX}/data
---> Using cache
---> 6e2b536021fe
Step 11/29 : RUN cd ${ENV_PREFIX}/src && git clone https://github.com/input-output-hk/jormungandr.git && cd jormungandr && printf "####\n# building branch: ${ENV_BRANCH}\n####\n" && git checkout ${ENV_BRANCH} && git submodule update --init --recursive && /bin/bash -c "source $HOME/.cargo/env;rustup update;cargo install --path jcli --force;cargo install --path jormungandr --force"
---> Running in 5cc83625c6de

Thanks.