Unless I missed it, it does not seem possible today to specify Docker build arguments (i.e. arguments passed when building an action's container.
Potential scenario: specify the tag of base image with a variable (whose value would be defined in the action metadata file and potentially controlled by inputs or environment variables).
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Yes, PLEASE! This is a blocker for something I want to do in an action, and it's tough to find a non-hacky feeling solution.