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gibsondan authored
Summary: Right now if you pass in an image name like "_my_example" the resulting error message is cryptic. Use a library I found on pypi to do validation (is there any process we need to cover before adding a new dependency? This one seems pretty small and self-contained - https://pypi.org/project/docker-image-py/). Test Plan: BK Reviewers: max, alangenfeld Reviewed By: alangenfeld Differential Revision: https://dagster.phacility.com/D6182
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