Some problems when building the `web` service were caused not by the `node` version but rather by the `npm` version, since `npm install -g npm` installs the most recent `npm` version and caused a conflict with the current `node` version (7.7.2).

There are some conflicts with the Node version used in containers (7.7.2) when running yarn and also the Node version declared in `.nvmrc` is 10.17.0, which probably indicates that this is the version that actually works.