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Update compose-file-v2.md
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- buildno=1
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- gitcommithash=cdc3b19
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> **Note**: if you specify `ARG` in your Dockerfile befor the `FROM` instruction,
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> then the `ARG` will not be available in the build instructions under `FROM`.
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> if you need a argument in both places, simply place it again under the `FROM` instruction.
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> **Note**: In your Dockerfile, if you specify `ARG` before the `FROM` instruction,
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> `ARG` is not available in the build instructions under `FROM`.
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> If you need an argument in both places, alsoo specify it under the `FROM` instruction.
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You can omit the value when specifying a build argument, in which case its value
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at build time is the value in the environment where Compose is running.
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