Enforce the installation of a specific Node version

This will help ensure a consistent major version of Node is
installed on each platform.

Author: hwillson

.circleci/config.yml

@@ -33,6 +33,9 @@ commands:
       - restore_cache:
           key: starwars-server
       - checkout
+      - run:
+          command: ./scripts/install-node.sh
+          name: Install Node
       - run:
           command: ./scripts/install-or-update-starwars-server.sh
           name: Install/Update StarWars Server

scripts/install-node.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+touch $BASH_ENV
+curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.3/install.sh | bash
+echo 'export NVM_DIR="$HOME/.nvm"' >> $BASH_ENV
+echo '[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"' >> $BASH_ENV
+echo nvm install 12 >> $BASH_ENV
+echo nvm alias default 12 >> $BASH_ENV
+echo nvm use default >> $BASH_ENV