[swh-graphql] Prepare the docker image generation
- Add missing swh-graphql dependencies
- Add the Dockerfile for the swh-graphql application
As it's the first application, everything is in a uniq Dockerfile. We'll see later if some parts can be factorized
Related to T4134
Test Plan
docker build -t swh-graphql .
docker run -ti --rm -v config.yml:/etc/swh/config.yml -p 5013:5013 swh-graphql
Migrated from D7846 (view on Phabricator)