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

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####> 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`