Force NVM to a fixed LTS version

[judereid]

We should extend the cli container to use the latest LTS version of node/npm

# Use a stock Docksal image as the base
FROM docksal/cli:2-php7.4

# nvm/node/npm are only available in the docker user context
USER docker

# Install additional global npm dependencies
RUN set -e; \
	# Initialize the user environment (this loads nvm)
	. $HOME/.profile; \
	# Install the necessary nodejs version
	nvm install 14.16.1; \
	nvm alias default 14.16.1; \