m-lab / speed-proxy / 21437743839

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feat: add Prometheus metrics with OTel sidecar (#5)

* feat: add Prometheus metrics with OTel sidecar

- Add metrics package exposing token request counter on :9990
- Add OTel Collector sidecar to scrape and push metrics to Prometheus
- Update cloudbuild.yaml to build/push OTel image and deploy via service.yaml
- Parallelize Docker builds for faster CI

* fix(service): use MLAB_PROJECT_PLACEHOLDER for TOKEN_EXCHANGE_URL

* feat: make ALLOWED_ORIGIN configurable via substitution

* fix(metrics): separate duration histogram by success/error result

* fix(metrics): add GCP resource detection for unique instance labels

Use resourcedetection/gcp processor to automatically add Cloud Run
metadata as metric labels, including unique faas_instance ID. This
prevents metric collisions when multiple instances report to Prometheus.

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