Add support for setting containerd log-level (default to info)

[analytically]

No description provided.

[taylorsilva]

Adding new configuration options results in more work. Are you open to assisting?

• Document it: https://github.com/concourse/docs/blob/b0cc52c38ebf01e7e4956249ff4a3b9899006fe7/lit/docs/install/worker.lit#L498-L505
• Update Helm and Bosh packaging:
  • https://github.com/concourse/concourse-chart/blob/c7c79fffe371c0b469cfeca0b38045d99f5b2a2f/values.yaml#L1801
  • https://github.com/concourse/concourse-bosh-release/blob/03b4d6e9227a9a6014a75bfd98269eed770303e6/jobs/worker/spec#L248-L354

I'll also note that it is currently possible to configure the containerd log level by pointing to a containerd config.toml with the following contents:

version = 2

[debug]
  level = "info"

Containerd config.toml docs: https://github.com/containerd/containerd/blob/main/docs/man/containerd-config.toml.5.md

This is something we could document as well.

[analytically]

I'll open PR's to document the flag.

[analytically]

concourse/docs#571
concourse/concourse-bosh-release#190
concourse/concourse-chart#397