Taskcluster-taskgraph

Added

- New `taskgraph.util.copy.deepcopy` function to assist deepcopying Task objects efficiently
- Toolchain tasks now support relative script paths

Fixed

- `taskgraph.util.templates.merge` no longer attempts to merge `by-<attribute>` configs
- Cached task digest now factors in Chain of Trust config
- Updated `verify_routes_notification_filters` to support all valid Taskcluster values

Removed

- Removed the `taskgraph.util.memoize` utility function

Fixed

- Invalid parameters passed to `IndexSearch` optimization from `docker` utility

Changed

- `IndexSearch` optimization supports both old and new (from 8.1.0) signatures

Added

- New Taskcluster utility functions to use the new Taskcluster `batch` APIs

Changed

- Optimization logic uses new `batch` APIs to vastly reduce number of queries made to Taskcluster

Fixed

- Regression to `files-changed` calculation for pull requests (494)
- Support `**kwargs` in functions wrapped by `taskgraph.util.memoize` (490)
- Support `--exclude-key` argument when the excluded key may or may not exist (489)
- Stop requiring REGISTRY and VERSION files for `taskgraph build-image` (488)

Added

- Ability to use custom name functions in `from_deps` transforms (484)
- New `from_deps` name function that doesn't strip the dep's kind (484)
- New cli flag to force using locally generated `files_changed` (481)

Fixed

- Support for `artifact-reference` with private artifacts (485)

Changed

- Replaced `head_ref` in pull-request cached task routes (486)
- Created a new `files_changed` parameter (481)

Removed

- Removed the `taskgraph.files_changed` module (481)

Changed

- Don't set 'base_ref' on github-release events (470)
- Faster yaml loading using the native loader if available (474)
- Memoize `get_task_definition` and `_get_deps` (477)