[llvm] [GitHub] Bump clang-tidy version to 21th and add sccache in CI (PR #160551)

[Baranov Victor via llvm-commits]

https://github.com/vbvictor created https://github.com/llvm/llvm-project/pull/160551

None

>From 1a060deb11a612b24205ae84e789dfcee05e6001 Mon Sep 17 00:00:00 2001
From: Victor Baranov <bar.victor.2002 at gmail.com>
Date: Wed, 24 Sep 2025 19:03:28 +0300
Subject: [PATCH] [GitHub] Bump clang-tidy version to 21th and add sccache in
 CI

---
 .github/workflows/pr-code-lint.yml | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/pr-code-lint.yml b/.github/workflows/pr-code-lint.yml
index bc70933147bd2..caa2a134c521d 100644
--- a/.github/workflows/pr-code-lint.yml
+++ b/.github/workflows/pr-code-lint.yml
@@ -19,8 +19,6 @@ jobs:
     defaults:
       run:
         shell: bash
-    container:
-      image: 'ghcr.io/llvm/ci-ubuntu-24.04:latest'
     timeout-minutes: 60
     concurrency:
       group: ${{ github.workflow }}-${{ github.ref }}
@@ -47,10 +45,13 @@ jobs:
           echo "Changed files:"
           echo "$CHANGED_FILES"
 
+      # The clang tidy version should always be upgraded to the first version
+      # of a release cycle (x.1.0) or the last version of a release cycle, or
+      # if there have been relevant clang-format backports.
       - name: Install clang-tidy
         uses: aminya/setup-cpp at 17c11551771948abc5752bbf3183482567c7caf0 # v1.1.1
         with:
-          clang-tidy: 20.1.8
+          clang-tidy: 21.1.0
       
       - name: Setup Python env
         uses: actions/setup-python at 42375524e23c412d93fb67b49958b491fce71c38 # v5.4.0
@@ -59,6 +60,13 @@ jobs:
 
       - name: Install Python dependencies
         run: python3 -m pip install -r llvm/utils/git/requirements_linting.txt
+
+      - name: Setup ccache
+        uses: hendrikmuhs/ccache-action at a1209f81afb8c005c13b4296c32e363431bffea5 # v1.2.17
+        with:
+          max-size: 2G
+          key: premerge-clang-tidy
+          variant: sccache
       
       # TODO: create special mapping for 'codegen' targets, for now build predefined set
       # TODO: add entrypoint in 'compute_projects.py' that only adds a project and its direct dependencies