[Solved] How to use environment variable in a string docker

lamp bottle Asks: How to use environment variable in a string docker
I have the following dockerfile:

   FROM alpine:latest
   RUN apk add wget
   RUN wget --http-user=foo@gmail.com --http-password=asdfghjhgfdf https://my.datomic.com/repo/com/datomic/datomic-pro/$VERSION/da    tomic-pro-$VERSION.zip -O datomic-pro-$VERSION.zip
   CMD ["datomic-pro-$VERSION/bin/transactor" "config/samples/dev-transactor-templ    ate.properties

Andin the last line I want to run datomic-pro-$VERSION/bin/transactor but the $VERSION depends on the environment variable. How do I make the string take the correct environment variable? Currently it uses the literal $VERSION and not what’s injected by the environment variable in the CMD.

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