How to use environment variables in docker compose

Question

I would like to be able to use env variables inside docker-compose.yml, with values passed in at the time of docker-compose up. This is the example.

I am

Answer 1

add env to .env file

Such as

VERSION=1.0.0

then save it to deploy.sh

INPUTFILE=docker-compose.yml
RESULT_NAME=docker-compose.product.yml
NAME=test

prepare() {
        local inFile=$(pwd)/$INPUTFILE
        local outFile=$(pwd)/$RESULT_NAME
        cp $inFile $outFile
        while read -r line; do
            OLD_IFS="$IFS"
            IFS="="
            pair=($line)
            IFS="$OLD_IFS"
               sed -i -e "s/\${${pair[0]}}/${pair[1]}/g" $outFile
            done <.env
     }
       
deploy() {
        docker stack deploy -c $outFile $NAME
}

        
prepare
deploy