Docker Tip #98: Nested Variable Interpolation with Docker Compose v2
This can be handy to have a variable default to another variable's values.
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TIMESTAMPS
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0:00 -- Intro
0:19 -- How nested variable interpolation looks
1:55 -- Confirming it still works
2:13 -- Change the PORT env variable to something else
3:00 -- Just a reminder, EXPOSE is mainly for documentation
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