### What changes were proposed in this pull request?
Introduce env `WORKDIR` into celeborn `docker/Dockerfile`.
### Why are the changes needed?
We should add `WORKDIR` in Dockerfile, this will lead us to `/opt/celeborn` when we get into Celeborn Containers.
According to https://docs.docker.com/engine/reference/builder/{}
> The WORKDIR instruction sets the working directory for any RUN, CMD, ENTRYPOINT, COPY and ADD instructions that follow it in the Dockerfile. If the WORKDIR doesn't exist, it will be created even if it's not used in any subsequent Dockerfile instruction.
And also we can find same `WORKDIR` in spark project
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| DEPLOY_ON_K8S.md | ||
| Dockerfile | ||