ARG default value across multiple stages

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How can I give a default value to MY_ARG if it is used across multiple stages?

ARG MY_ARG 

FROM something as base 
# use ARG here

FROM other as final 
# use ARG here
1 Answers

Alright. Apparently it is as simple as doing

ARG MY_ARG=some-value

FROM something as base 
# use ARG here

FROM other as final 
# use ARG here
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