services: postgres: image: 'postgres:${POSTGRES_VERSION}' environment: POSTGRES_USER: user POSTGRES_PASSWORD: password backup: build: context: '..' args: ALPINE_VERSION: '${ALPINE_VERSION}' environment: # test constants POSTGRES_HOST: postgres POSTGRES_DATABASE: postgres POSTGRES_USER: user POSTGRES_PASSWORD: password S3_ACCESS_KEY_ID: S3_SECRET_ACCESS_KEY: S3_REGION: S3_BUCKET: # test variables PASSPHRASE: SCHEDULE: BACKUP_KEEP_DAYS: S3_PREFIX: