Specify multiple plugin names separated by comma doesn't work

Have you read the documentation?

• Yes, I've read the how to make a reproducable bug guide
• Yes, I've read the how to debug my script guide

URL

https://www.sitespeed.io/

What are you trying to accomplish

I had tried to pass multiple plugins and it failed.

Documentation:

--plugins.add     
Extra plugins that you want to run. Relative or absolute path to the plugin.
Specify multiple plugin names separated by comma, or repeat the --plugins.add option

There's mention two possible options how to pass multiply plugins.

1. separated by comma or 2. repeat the flag

If pass like this, separated by comman -plugins.add=@sitespeed.io/plugin-influxdb,@sitespeed.io/plugin-lighthouse it fails

What browser did you use?

Chrome

How to reproduce

*Pre-condition: Run docker-compose with InfluxDB

If chose to repeat option and pass each plugin separatly - it works as expected

docker run --net host --rm --name sitespeed_test \
  -v "$(pwd):/sitespeed.io" \
  sitespeedio/sitespeed.io:37.3.0-plus1 \
  https://www.sitespeed.io/ \
  --n 1 \
  --plugins.add=@sitespeed.io/plugin-influxdb \
  --plugins.add=@sitespeed.io/plugin-lighthouse \
  --influxdb.host 127.0.0.1 \
  --influxdb.port 8087 \
  --influxdb.version 2 \
  --influxdb.organisation sitespeed \
  --influxdb.token sitespeed

But if pass as a string with separated plugins by comma:

docker run --net host --rm --name sitespeed_test \
  -v "$(pwd):/sitespeed.io" \
  sitespeedio/sitespeed.io:37.3.0-plus1 \
  https://www.sitespeed.io/ \
  --n 1 \
  --plugins.add="@sitespeed.io/plugin-influxdb,@sitespeed.io/plugin-lighthouse" \
  --influxdb.host 127.0.0.1 \
  --influxdb.port 8087 \
  --influxdb.version 2 \
  --influxdb.organisation sitespeed \
  --influxdb.token sitespeed

Log output

ERROR: Error: Required option(s) [ '"database"' ] need to be specified in namespace "influxdb"
    at throwIfMissing (file:///usr/local/lib/node_modules/@sitespeed.io/plugin-influxdb/lib/util.js:134:11)
    at InfluxDBPlugin.open (file:///usr/local/lib/node_modules/@sitespeed.io/plugin-influxdb/lib/index.js:21:5)
    at file:///usr/src/app/lib/sitespeed.js:50:47
    at Array.map (<anonymous>)
    at runOptionalFunction (file:///usr/src/app/lib/sitespeed.js:50:6)
    at run (file:///usr/src/app/lib/sitespeed.js:147:7)
    at async start (file:///usr/src/app/bin/sitespeed.js:147:22)
    at async file:///usr/src/app/bin/sitespeed.js:203:1

Start with the plugin-loading path in lib/sitespeed.js and the command entry point in bin/sitespeed.js, then reproduce the two docker commands using the comma-separated and repeated --plugins.add forms. Confirm the fix by verifying that the comma-separated invocation loads both plugins without the reported missing-option error.