docker: Install node (#669)

docker/build/Dockerfile

@@ -14,6 +14,7 @@ ARG ANCHOR_CLI
 ENV HOME="/root"
 ENV PATH="${HOME}/.cargo/bin:${PATH}"
 ENV PATH="${HOME}/.local/share/solana/install/active_release/bin:${PATH}"
+ENV PATH="${HOME}/.nvm/versions/node/v16.8.0/bin:${PATH}"
 
 # Install base utilities.
 RUN mkdir -p /workdir && mkdir -p /tmp && \
@@ -26,6 +27,15 @@ RUN curl "https://sh.rustup.rs" -sfo rustup.sh && \
     sh rustup.sh -y && \
     rustup component add rustfmt clippy
 
+# Install node / npm / yarn.
+RUN curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.11/install.sh | bash
+ENV NVM_DIR="${HOME}/.nvm"
+RUN . $NVM_DIR/nvm.sh && \
+    nvm install node --latest-npm && \
+    nvm use node && \
+    nvm alias default node && \
+    npm install -g yarn
+
 # Install Solana tools.
 RUN sh -c "$(curl -sSfL https://release.solana.com/${SOLANA_CLI}/install)"