Log request origins

[abcampo-iry]

Status

• Closes #1588

What's changed?

• Adds the request Origin header to the structured completed-request payload.
• Applies the logging to requests through ApiController.
• Adds request specs covering requests with and without an Origin header.
• Makes the origin available for filtering and grouping request logs in Better Stack.

[Copilot]

Pull request overview

Adds request Origin header data into Rails’ controller instrumentation payload for API requests, enabling downstream structured logging (via Semantic Logger) to filter/group by request origin as requested in issue #1588.

Changes:

• Append origin to the process_action.action_controller payload for controllers inheriting from ApiController when the header is present.
• Add request specs asserting the payload includes origin when provided and omits it otherwise.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
app/controllers/api_controller.rb	Overrides append_info_to_payload to include origin in the controller instrumentation payload when present.
spec/requests/api_controller_spec.rb	Adds request specs that subscribe to process_action.action_controller and validate presence/absence of the origin payload field.

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[github-actions]

Test coverage

92.18% line coverage reported by SimpleCov.
Run: https://github.com/RaspberryPiFoundation/editor-api/actions/runs/30279908881

[zetter-rpf]

Nice, it's good to have an example of how to add something to the logs too.

I can deploy and check betterstack once merged.