radiodan-apps: set $HOME for npm install
radiodan-apps: set $HOME for npm install

npm puts byproducts into $HOME/.npm, so we have to point HOME at somewhere
sensible to avoid leaking this onto host -- point it at WORKDIR.

radiodan/meta-radiodan,radiodan/meta-radiodan,radiodan/meta-radiodan,radiodan/meta-radiodan,radiodan/meta-radiodan,radiodan/meta-radiodan