Specify the Docker Compose file for SchooLink's backend.

Repositories/SchooLinks/.envrc

 # shellcheck shell=bash disable=SC1091
 # vim: ft=sh
 source_up
+export COMPOSE_FILE='docker-compose.local.yml'
 export GIT_AUTHOR_EMAIL='nimrod@schoolinks.com'
 export GIT_AUTHOR_NAME='Nimrod Adar'
 export PIPENV_VENV_IN_PROJECT=1