https://github.com/direnv/direnv/issues/319

Dockerfile

FROM ubuntu:noble AS base

RUN <<-EOF
  apt-get update &&
    apt-get install -y \
      curl \
      git
EOF

#############################################

FROM base AS nvm

SHELL ["/bin/bash", "-c"]

# Setup nvm
RUN <<-EOF
  set -x

  export NVM_DIR="$HOME/.nvm" && (
    git clone https://github.com/nvm-sh/nvm.git "$NVM_DIR"
    cd "$NVM_DIR"
    git checkout `git describe --abbrev=0 --tags --match "v[0-9]*" $(git rev-list --tags --max-count=1)`
  ) && \. "$NVM_DIR/nvm.sh"

  nvm install v20.18.0
  nvm install v22.9.0
EOF

RUN <<-EOF
  echo 'export NVM_DIR="$HOME/.nvm"' >> ~/.bashrc
  echo '[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh" # This loads nvm' >> ~/.bashrc
  echo '[ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion' >> ~/.bashrc
EOF

# Setup direnv

RUN curl -L -o /usr/local/bin/direnv https://github.com/direnv/direnv/releases/download/v2.35.0/direnv.linux-amd64
RUN chmod a+x /usr/local/bin/direnv
RUN echo 'eval "$(direnv hook bash)"' >> ~/.bashrc

RUN <<-EOF
mkdir -p ~/.config/direnv/

# https://github.com/direnv/direnv/wiki/Node#using-nvm
cat <<-'SCRIPT' > ~/.config/direnv/direnvrc
  use_nvm() {
    local node_version=$1

    nvm_sh=~/.nvm/nvm.sh
    if [[ -e $nvm_sh ]]; then
      source $nvm_sh
      nvm use $node_version
    fi
  }
SCRIPT
EOF

RUN mkdir /work
WORKDIR /work

#############################################

FROM nvm AS test-nvm

SHELL ["/bin/bash", "-c"]

RUN <<-EOF
  set -x

  mkdir /work/v20-use-node
  cd /work/v20-use-node
  echo NODE_VERSIONS=\$HOME/.nvm/versions/node > .envrc 
  echo NODE_VERSION_PREFIX=v >> .envrc 
  echo use node >> .envrc 
  echo 20 > .node-version
  direnv allow
  cd -

  mkdir /work/v20-use-nvm
  cd /work/v20-use-nvm
  echo use nvm 20 >> .envrc 
  direnv allow
  cd -

  mkdir /work/v22-use-node
  cd /work/v22-use-node
  echo NODE_VERSIONS=\$HOME/.nvm/versions/node > .envrc 
  echo NODE_VERSION_PREFIX=v >> .envrc 
  echo use node >> .envrc 
  echo 22 > .node-version
  direnv allow
  cd -

  mkdir /work/v22-use-nvm
  cd /work/v22-use-nvm
  echo use nvm 22 >> .envrc 
  direnv allow
  cd -
EOF

CMD bash -l