fix: add METAFLOW_S3_ENDPOINT_URL to minio config output

Without this, S3_ENDPOINT_URL is None in the local env and step-functions
create/batch tasks can't reach the minio S3 emulator.

Author: Nissan Pow

devtools/tilt/minio.tiltfile

@@ -40,6 +40,7 @@ def setup_minio(ctx):
         config={
             "METAFLOW_DEFAULT_DATASTORE": "s3",
             "METAFLOW_DATASTORE_SYSROOT_S3": "s3://metaflow-test/metaflow",
+            "METAFLOW_S3_ENDPOINT_URL": "http://localhost:9000",
             "METAFLOW_DATATOOLS_CLIENT_PARAMS": {
                 "endpoint_url": "http://localhost:9000",
                 "config": {