Install deps as part of GitHub Actions workflow
Install deps as part of GitHub Actions workflow

..forgot to install dependencies before executing
`$ npm test` which obviously exploded due to the
fact that `eslint` and friends weren't available.
janl/mustache.js,janl/mustache.js,phillipj/mustache.js,janl/mustache.js,phillipj/mustache.js,janl/mustache.js,janl/mustache.js,phillipj/mustache.js,phillipj/mustache.js,phillipj/mustache.js