docker(libervia): build site in the image: this will avoid a build each time the container starts fresh (notably with tests), as this is time and resource consuming (notably with node modules which would need to be downloaded each time).

# XXX: the Monkey Patch is here and not in src/__init__ to avoir issues with pyjamas compilation
# TODO: remove this when changes are merged in Wokkel
from sat_tmp.wokkel import install
install()