Description of the problem, including code/CLI snippet

It doesn't seem possible to trigger a pipeline and send variables from the CLI, but maybe I'm doing something wrong? I was hoping to use the cli instead of a bunch of curl for easier project id resolution, but I admit JSON on the CLI is gross and I should probably just do it directly in three lines of python.

Example I'm trying:

gitlab project trigger-pipeline \        --id 43 \        --ref "dev" \        --token "XXXXXXX" \        --variables "{\"TEST\": \"??????????\"}"

If you run a pipeline trigger with debug on, you can see that it's sending an empty variables dictionary by default:

send: b'{"ref": "dev", "token": "XXXXXXX", "variables": {}}'

Expected Behavior

Trigger pipeline with variables

Actual Behavior

gitlab: error: unrecognized arguments: --variables {"TEST": "??????????"}

Specifications

• python-gitlab version: 1.7.0
• API version you are using (v3/v4): v4
• Gitlab server version (or gitlab.com): 11.5.3-ee