podman/docs/source/markdown/options/secret.image.md

####> This option file is used in: ####> podman build, farm build ####> If file is edited, make sure the changes ####> are applicable to all of those.

--secret=id=id,src=path

Pass secret information used in the Containerfile for building images in a safe way that are not stored in the final image, or be seen in other stages. The secret is mounted in the container at the default location of /run/secrets/id.

To later use the secret, use the --mount option in a RUN instruction within a Containerfile:

RUN --mount=type=secret,id=mysecret cat /run/secrets/mysecret