---
# System prepended metadata

title: Untitled

---


### Flow Charts


```sequence
user->github: Create PR
github->workflow_run: Trigger workflow
workflow_run->workflow_run: Trigger workflow
workflow_run->workflow_run: Build Docker image
workflow_run->gcr: Push Docker image
workflow_run->cloud_run: Start service
cloud_run->gcr: Pull image
cloud_run->pull_request_target: Return link
workflow_run->github: Publish preview URL as a comment
```

```sequence
user->github: Create PR
github->pull_request: Trigger workflow
pull_request->http_service: Trigger external service
pull_request->gcr: Ask for Docker image ready
http_service->http_service:Build Docker image
http_service->gcr: Push Dockerimage
http_service->cloud_run: Start service
cloud_run->gcr: Pull image
cloud_run->http_service: Return link
http_service->github: Publish preview URL as a comment
```