How to create github action without using action.yml and publish into marketplace

I have seen the many repo doesn’t contain any action.yml file and it’s only contain Dockerfile with

LABEL "com.github.actions.name"=""
LABEL "com.github.actions.description"=""
LABEL "com.github.actions.icon"="folder-plus"

.

.

but still they appears in the Github marketplace as an Action. How it’s happening.

action.yml requirement wasn’t enforced during beta until this change.

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Thank you for your feedback. :slight_smile: