Workflows as code

Feature request

Is your feature request related to a problem?

Currently workflows live in posthog. We cannot test their behaviour, ensure that we don't add regressions to them by changing event properties, version control them, nor propagate them through environments

Describe the solution you'd like

We would like to be able to programatically set them up, maybe with posthog SDK.
An example would be programming them in the repository and deploying them with the CI (e.g. github and github action)

Describe alternatives you've considered

Handling them via Infrastructure As Code with something like https://pulumi.khanh.id/docs/providers/posthog

Debug info

- [ ] PostHog Cloud, Debug information: [please copy/paste from https://us.posthog.com/settings/project-details#variables]
- [ ] PostHog Hobby self-hosted with `docker compose`, version/commit: [please provide]
- [ ] PostHog self-hosted with Kubernetes (deprecated, see [`Sunsetting Kubernetes support`](https://posthog.com/blog/sunsetting-helm-support-posthog)), version/commit: [please provide]

Start by examining the PostHog SDK or workflow APIs and the repository's GitHub Actions configuration; the issue names no specific files, tests, or entry points. Define how workflows can be represented in version control, tested for event-property regressions, and deployed across environments, then confirm those paths before implementation.