ENV

ENV yourvar=yourvalue

Related

env:
docker run -e
--env-file
docker-compose

See also

• Dockerfile: FROM, RUN, CMD, ENTRYPOINT, WORKDIR, COPY, ADD, USER, ENV, ARG, HEALTHCHECK, hadolint, LABEL, EXPOSE
• docker build [ --tag | --platform | --help ] FROM, Dockerfile, .dockerignore, requirements.txt, docker build --help, docker tag