Add S3 configuration instructions to FrequentTasks.md

[lbakerchef]

Signed-off-by: Lincoln Baker [email protected]

Description

Inward-facing developer documentation.

Issues Resolved

[List any existing issues this PR resolves, or any Discourse or StackOverflow discussions that are relevant]

Check List

• [ ] New functionality includes tests
• [ ] All buildkite tests pass
• [ ] Full omnibus build and tests in buildkite pass
• [ ] All commits have been signed-off for the Developer Certificate of Origin. See https://github.com/chef/chef/blob/main/CONTRIBUTING.md#developer-certification-of-origin-dco
• [ ] PR title is a worthy inclusion in the CHANGELOG

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