feat(webapp): add RUNTIME_API_ORIGIN to decouple runner traffic from external origin

[deepshekhardas]

Rebased version of #3686. Adds RUNTIME_API_ORIGIN env var, which routes managed runner TRIGGER_API_URL/TRIGGER_STREAM_URL through an in-cluster origin (bypassing tracing gateways that rewrite traceparent). Dev CLI runs unaffected. Updates docker-compose, helm chart, .env.example, and docs. Closes #3686.

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📥 Commits

Reviewing files that changed from the base of the PR and between debfa2b and 29b5c66.

📒 Files selected for processing (8)

• .server-changes/runtime-api-origin.md
• apps/webapp/app/env.server.ts
• apps/webapp/app/v3/environmentVariables/environmentVariablesRepository.server.ts
• docs/self-hosting/env/webapp.mdx
• hosting/docker/.env.example
• hosting/docker/webapp/docker-compose.yml
• hosting/k8s/helm/templates/webapp.yaml
• hosting/k8s/helm/values.yaml

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Walkthrough

The webapp now accepts an optional RUNTIME_API_ORIGIN value and normalizes blank values to undefined. Production managed runner API and stream URLs prefer this value and retain existing origin fallbacks when it is unset. Docker Compose and Helm deployment configuration can provide the value. Self-hosting documentation and the server change entry describe its use.

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.