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Add an example of accessing the secrets file without root permissions #560

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17 changes: 17 additions & 0 deletions docs/advanced/secrets.md
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Expand Up @@ -13,6 +13,23 @@ RUN --mount=type=secret,id=github_token \
cat /run/secrets/github_token
```

If you need access to the `secrets` file from a non-root user, you'll need to set the `uid` in the `--mount` argument:

```Dockerfile
#syntax=docker/dockerfile:1.2

FROM alpine

# Create non-root user
RUN addgroup -S newuser && adduser -u 1001 -S -g newuser newuser

# Run everything after as non-privileged user.
USER newuser

RUN --mount=type=secret,uid=1001,id=github_token \
cat /run/secrets/github_token
```

As you can see we have named our secret `github_token`. Here is the workflow you can use to expose this secret using
the [`secrets` input](../../README.md#inputs):

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