also source scripts/build.sh in coverage job for consistency [skip ci]
also source scripts/build.sh in coverage job for consistency [skip ci]

oxidase/node-osrm,Project-OSRM/node-osrm,Project-OSRM/node-osrm,Project-OSRM/node-osrm,oxidase/node-osrm,oxidase/node-osrm