[FLINK-13017][docs] do not mount local $HOME into docker

[NicoK]

What is the purpose of the change

Remove the (writable!) mount of a user's $HOME into the dockerized documentation build container in order to

• make the builds independent from the host system (making them reproducible)
• not have the commands in the container affect the host

Brief change log

• remove mounting user $HOME

Verifying this change

I verified building the docs inside the new environment.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): no
• The public API, i.e., is any changed class annotated with @Public(Evolving): no
• The serializers: no
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: no
• The S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented? not applicable

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[sjwiesman]

I noticed that the run script did not originally mount$HOME and then that was added by @patricklucas in #3751. Patrick can you just verify that removing this won't break something, I trust your docker knowledge over either of ours.

[NicoK]

originally, it pointed to /home/${USER_NAME} which (on Linux) is basically the same - Patrick only made it work on MacOS as well

[sjwiesman]

Gotcha, then +1

[NicoK]

@sjwiesman Did you try building the docs with these changes? Just to be on the safe side and have someone else verify with a different OS at least (I'm on Linux)

[sjwiesman]

Yes. I successfully built with these changes on a Mac

[StephanEwen]

Looks good to me, merging this...