variables: DEFAULT_CONTAINER_REGISTRY: 'publicmirror.azurecr.io' COMMON_LIB_BUILD_ENVS: 'bullseye' SONIC_SLAVE_DOCKER_DRIVER: 'overlay2' SONIC_BUILD_RETRY_COUNT: 3 SONIC_BUILD_RETRY_INTERVAL: 600 DOCKER_BUILDKIT: 0 DOCKER_BUILD_TIMEOUT: 3600 MIRROR_SNAPSHOT: y