docker ako echo env premenná v bash
docker exec <container-name> env
dockerfile VAR.
ENV abc=hello
ENV abc=bye def=$abc
ENV ghi=$abc
Dockerfile env variabes
FROM busybox
ENV foo /bar
WORKDIR ${foo} # WORKDIR /bar
ADD . $foo # ADD . /bar
COPY \$foo /quux # COPY $foo /quux