Add build worker integration tests with worker type filtering

[jwmossmoz]

Summary

• Add support for running Gecko build tasks on alpha worker pools through the integration test pipeline
• Add filter_by_worker_type.py transform to filter replicated tasks by workerType
• Add cross-provisioner pool mapping support to handle gecko-3/b-win2022 → gecko-1/b-win2022-alpha

Problem

When testing build workers like b-win2022, there was no way to run build tasks through the worker-images integration test pipeline. The Firefox os-integration system only includes test tasks (TEST_KINDS), not builds. Users had to manually push to try with worker overrides to test build tasks on alpha pools.

Solution

1. New filter_by_worker_type.py transform: Filters replicated tasks by their workerType field in the task definition. This allows selecting specific tasks (like builds) that use a particular worker type.

2. Enhanced integration_test.py transform:

   • Added worker-pool-mappings schema support for explicit pool mappings
   • Supports cross-provisioner mappings (e.g., gecko-3 → gecko-1)
   • Fixed label prefix matching to use longest-match-first ordering

3. New gecko-builds task in kind.yml:

   • Replicates build tasks from mozilla-central decision task
   • Filters to only b-win2022 worker type
   • Maps gecko-3/b-win2022 to gecko-1/b-win2022-alpha

Note on Chain of Trust

The cross-provisioner mapping redirects level 3 builds (gecko-3) to level 1 alpha pools (gecko-1). CoT will not be valid for these integration test runs, but this is acceptable since we're testing the worker image functionality, not producing release artifacts.

Usage

The configuration in kind.yml:

gecko-builds:
  description: "Run Gecko build tasks on alpha worker pools"
  filter-worker-types:
    - b-win2022
  worker-pool-mappings:
    gecko-3/b-win2022: gecko-1/b-win2022-alpha
  replicate:
    target:
      - gecko.v2.mozilla-central.latest.taskgraph.decision
    include-attrs:
      kind:
        - build
    exclude-attrs:
      build_platform:
        - android
        - macosx
        - linux

Test plan

• Run TASK_ID=test-task-id uv run taskgraph full --fast -k integration-test locally
• Verify build tasks appear in output with correct pool mapping
• Verify provisionerId: gecko-1 and workerType: b-win2022-alpha in task JSON
• Run integration tests on Taskcluster to verify end-to-end

Files changed

• taskcluster/kinds/integration-test/kind.yml - Added gecko-builds task definition
• taskcluster/worker_images_taskgraph/transforms/filter_by_worker_type.py - New transform
• taskcluster/worker_images_taskgraph/transforms/integration_test.py - Added pool mapping support

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