[hf] repair env var directives in prod docker config
- symptom: prod docker-compose invocation is failing with
Unsupported config option for services.signald_0: 'VIRTUAL_HOST'
- problem: in
docker-compose.override
just providedVIRTUAL_HOST
k/v pair without nesting it within anenvironment:
map - fix: add
environment:
directive to each signald service config