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docs: fix env syntax

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Signed-off-by: eitsupi <50911393+eitsupi@users.noreply.github.com>
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@ -313,7 +313,7 @@ So it can be used with our [Docker Build Push action](https://github.com/docker/
- uses: docker/build-push-action@v4
with:
build-args: |
DOCKER_METADATA_OUTPUT_JSON
${{ env.DOCKER_METADATA_OUTPUT_JSON }}
```
### environment variables