ci: align pre-commit hooks and GitHub templates

[mc-nv]

What does the PR do?

Aligns this repository with the org-wide setup consolidated in triton-inference-server/.github:

• .pre-commit-config.yaml: shared baseline hooks, conventional-commit message validation (commit-msg stage), and the centralized add-license hook from the org .github repository (rev: v1.4.3 — excludes .github/ templates, never rewrites LICENSE files).
• Pre-commit CI runs only on files modified by the PR.
• Caller stub for the org-wide reusable conventional-pr workflow (@v1.4.3): validates the PR title against Conventional Commits (hard gate — it becomes the squash-merge commit), derives one human-readable label per distinct type found in the title and all conforming commit subjects (e.g. ci: → CI/CD, feat: → feature, fix: → fix), enforces org-wide label colors/descriptions, detects cherry-picks, and fails if no type is derivable and no type label is assigned.
• No per-repo templates: PR templates and issue routing are inherited from the org-wide defaults in triton-inference-server/.github (issues route to the server repository).

Depends on triton-inference-server/.github#5 (pinned tags current: v1.4.3 — already exist, CI is green).

Pros / Cons

Pros

• Single home (org .github repo) for hooks, templates, issue routing, and the PR-title workflow — one change propagates everywhere.
• Repos carry only a config file and two small workflow stubs; no template copies to drift.
• Commit/PR title format enforced both locally (commit-msg hook) and in CI (reusable workflow), with automatic type labels.
• License hooks never modify LICENSE files.

Cons / risks

• Version-pinned dependency on the org .github repository (tags are write-once; changes ship as a new tag + rev bump).
• Template inheritance requires the org .github repository to remain public.

Related Issues / PRs

• Resolves: TRI-1100

Related PRs:

• ci: migrate the centralized add-license hook to the org .github repository developer_tools#61
• ci: align pre-commit hooks and GitHub templates core#517
• ci: align pre-commit hooks and GitHub templates common#161
• ci: align pre-commit hooks and GitHub templates backend#127
• ci: align pre-commit hooks and GitHub templates python_backend#449
• ci: align pre-commit hooks and GitHub templates tensorrt_backend#124
• ci: align pre-commit hooks and GitHub templates onnxruntime_backend#351
• ci: align pre-commit hooks and GitHub templates pytorch_backend#200
• ci: align pre-commit hooks and GitHub templates openvino_backend#119
• ci: align pre-commit hooks and GitHub templates identity_backend#36
• ci: align pre-commit hooks and GitHub templates local_cache#16
• ci: align pre-commit hooks and GitHub templates redis_cache#24
• ci: align pre-commit hooks and GitHub templates repeat_backend#19
• ci: align pre-commit hooks and GitHub templates square_backend#22
• ci: align pre-commit hooks and GitHub templates third_party#80
• ci: align pre-commit hooks and GitHub templates triton_cli#127
• ci: align pre-commit hooks and GitHub templates tutorials#158
• ci: align pre-commit hooks and GitHub templates server#8890
• ci: align pre-commit hooks and GitHub templates client#909
• ci: align pre-commit hooks and GitHub templates tensorrtllm_backend#861
• ci: align pre-commit hooks and GitHub templates vllm_backend#133
• ci: align pre-commit hooks and GitHub templates perf_analyzer#467
• chore: never modify the COPYRIGHT template and guard .github templates model_analyzer#1032

Test plan

• pre-commit validate-config passes; pre-commit run --files <PR diff> passes locally with the centralized hooks pinned to the .github branch SHA.
• After .github#5 merges and v1.4.3 exists: the conventional-pr check validates this PR's own title and applies the ci label.
• No LICENSE file content is changed by this PR.

Caveats

• None beyond the merge-order note above.

Checklist

• PR title follows <commit_type>: <Title> (conventional commit)
• I ran pre-commit locally on all files changed by this PR and it passes
• Copyright header is correct on all changed files
• External contributors: I have read the Contribution guidelines and signed the Contributor License Agreement

[Vinya567]

@greptileai

[greptile-apps]

Greptile Summary

This PR aligns the repository's CI configuration with the org-wide setup in triton-inference-server/.github, replacing standalone workflow steps with thin callers that delegate to pinned reusable workflows at v1.4.3.

• conventional-pr.yml: New workflow that calls the org-wide reusable conventional-pr.yml@v1.4.3; correctly distinguishes same-repo PRs (pull_request) from fork PRs (pull_request_target) via an explicit if condition so the job never fires twice, and passes only the minimum required write permissions (pull-requests, issues).
• pre-commit.yml: Replaces pre-commit/action with a custom run step using null-delimited output (-z / xargs -0) to safely handle file paths with spaces, adds a pre-commit cache keyed on the config file hash, and limits hook execution to files actually modified by the PR.
• .pre-commit-config.yaml: Adds default_install_hook_types: [pre-commit, commit-msg], the conventional-pre-commit hook scoped to the commit-msg stage, and the org-wide add-license hook pinned to v1.4.3; fixes ambiguous spaces in the flake8 --extend-ignore argument.

Confidence Score: 5/5

Safe to merge — all changes are CI/tooling configuration with no application logic affected.

The changes are confined to CI workflow files, pre-commit configuration, and a copyright year update. The null-delimited git diff approach correctly handles filenames with spaces. The pull_request_target guard correctly restricts that event to fork PRs only, passes minimal write permissions, and delegates to a pinned reusable workflow that does not check out PR code. No application code is touched.

No files require special attention.

Important Files Changed

Filename	Overview
.github/workflows/conventional-pr.yml	New thin caller workflow that delegates to the org-wide reusable conventional-pr workflow at v1.4.3; correctly gates pull_request vs pull_request_target on fork vs same-repo PRs, with write permissions scoped to PR labeling only.
.github/workflows/pre-commit.yml	Replaces the pre-commit action with a custom run step using null-delimited git diff output (-z / xargs -0) to correctly handle paths with spaces, adds pre-commit cache, and limits runs to PR-modified files only.
.pre-commit-config.yaml	Adds default_install_hook_types for commit-msg stage, conventional-pre-commit hook, and org-wide add-license hook pinned to v1.4.3; flake8 args reformatted to avoid ambiguous spaces around =.
LICENSE	Copyright year updated from 2021 to 2021-2026; no substantive license content changed.

Sequence Diagram

sequenceDiagram
    participant Dev as Developer
    participant GH as GitHub PR Event
    participant CPR as conventional-pr.yml caller
    participant OrgWF as org .github conventional-pr.yml at v1.4.3
    participant PC as pre-commit.yml
    participant PCHooks as Pre-commit Hooks

    Dev->>GH: Opens or updates PR
    GH->>CPR: pull_request same-repo OR pull_request_target fork
    CPR->>CPR: if condition routes by fork vs same-repo
    CPR->>OrgWF: uses conventional-pr.yml at v1.4.3 with write permissions
    OrgWF-->>GH: Validate PR title, derive label, detect cherry-picks
    GH->>PC: pull_request event
    PC->>PC: checkout fetch-depth 2 and restore cache
    PC->>PC: "git diff -z --diff-filter=d HEAD^1 HEAD"
    PC->>PCHooks: xargs -0 pre-commit run --files
    PCHooks-->>PC: isort, black, flake8, clang-format, codespell, add-license
    PC-->>GH: Pass or Fail
    Dev->>Dev: git commit locally
    Dev->>PCHooks: commit-msg hook fires via conventional-pre-commit
    PCHooks-->>Dev: Validates type colon title format

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_{Reviews (2): Last reviewed commit: "ci: harden CI workflows and configs per ..." | Re-trigger Greptile}

[Vinya567]

LGTM.

[mc-nv]

Closing: the team is moving away from centralized org-level configuration in favor of per-repository self-contained setups (see triton-inference-server/server#8897 for the first decentralized implementation). Branch retained for reference. TRI-1100