Use correct values for log_format

Brie Carranzarequested to merge
bcarranza-use-correct-log_format-value into main

What does this MR do?

This MR adjusts the Advanced configuration docs for GitLab Runner to use the correct values for log_format.

We list log_format = "info" in a few places. However, info is not an acceptable value for log_format based on how we describe that field in the docs.

Why was this MR needed?

This MR is needed to make the Advanced configuration docs for GitLab Runner accurate on this point.

What's the best way to test this MR?

Configure gitlab-runner with a config.toml like this:

concurrent = 1
check_interval = 0
shutdown_timeout = 0
log_format = "info"
[session_server]
  session_timeout = 1800

Restart the service.

Run a command like this:

journalctl -u gitlab-runner.service -f

Observe output like this:

Feb 21 19:38:53 sr-env-fca2da0c-runner gitlab-runner[72356]: FATAL: Service run failed                           error=unknown log format &{%!q(bool=false) %!q(bool=false)}, expected one of: [runner text json]

What are the relevant issue numbers?

0️⃣ See gitlab#503799 (closed); I noticed this when I was taking a look at a ticket.

🦊 GitLab team members with access to Zendesk can learn more in the 🎫 ticket.

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