How to set secret db password in docker file

  docker, dockerfile

I am new to Docker space.
I need some assistance here and my dockerfile code is below

This code is working fine but the password for DB I am passing is not correct, they want
to do give the password secretly, so people don’t know the password whoever will see the dockerfile.

How can I pass the password correctly?

FROM postgres:12
ENV POSTGRES_PASSWORD Welcome123
ENV POSTGRES_DB POSTGRESDB
ENV POSTGRES_USER postgres
COPY ./Scripts /docker-entrypoint-initdb.d/

Source: Docker Questions

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