Cloud SQL proxy in a docker compose file

docker-compose.yml

# ---------------------------------------------------------------
# add the service in the docker-compose.yml file
# use .env file to define
#   CLOUD_SQL_INSTANCE
#   CLOUD_SQL_PORT
#   GC_SQL_SERVICE_CREDENTIALS_FILE
#
# @link https://cloud.google.com/sql/docs/sqlserver/connect-docker
# ----------------------------------------------------------------
cloud_sql_service:
  container_name: cloudsql-proxy
  env_file:
    - .env
  image: gcr.io/cloud-sql-connectors/cloud-sql-proxy:2.11.0
  command: ${CLOUD_SQL_INSTANCE} --address 0.0.0.0 --port ${CLOUD_SQL_PORT} --credentials-file /var/credentials-file.json
  ports:
    - ${CLOUD_SQL_PORT}:${CLOUD_SQL_PORT}
  volumes:
    - ${GC_SQL_SERVICE_CREDENTIALS_FILE}:/var/credentials-file.json
  networks:
    - the_network