Pulsar Standalone Docker image does not work.

**Describe the bug**
Following the instructions on the Apache Pulsar documentation site found [here](https://pulsar.apache.org/docs/getting-started-docker), the pulsar cluster fails to start.

**To Reproduce**
Steps to reproduce the behavior:
1. On a machine with Docker installed, open a shell
2. Run the following command:
$ docker run -it -p 6650:6650 -p 8080:8080 --mount source=pulsardata,target=/pulsar/data --mount source=pulsarconf,target=/pulsar/conf apachepulsar/pulsar:@pulsar:version@ bin/pulsar standalone
3. See error

**Expected behavior**
A pulsar cluster should run inside a docker container without errors

**Screenshots**
Here is a [link](https://asciinema.org/a/iNUUEx3mK1ywI7AzD1xgwF6kd) to a recording of this behavior.

**Desktop (please complete the following information):**
- OS: Macbook

Start with the Docker instructions at the linked getting-started page and reproduce the documented docker run command on a machine with Docker installed. Inspect the linked recording and container output to identify why bin/pulsar standalone fails; done means the Pulsar cluster starts without errors using the documented command.

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