GitLab CI Events Proposal 2: Using the rules keyword

Can we do it with our current rules system?

workflow:
  rules:
    - events: ["package/*"]

test_package_published:
  script: echo testing published package
  rules:
    - events: ["package/published"]

test_package_removed:
  script: echo testing removed package
  rules:
    - events: ["package/removed"]

1. We don’t upsert subscriptions to the database.
2. We’ll have a single worker which runs when something happens in GitLab.
3. The worker just tries to create a pipeline with the correct parameters.
4. Pipeline runs when rules subsystem finds a job to run.

Challenges

1. For every defined event run, we need to enqueue a new pipeline creation worker.
2. Creating pipelines and selecting builds to run is a relatively expensive operation
3. This will not work on GitLab.com scale.

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