[Github] Make pr-code-format.yml use ci-*-format container (#163044)

This allows us to not spend 60-90s per job installing all of the tools
as they are prebuilt into the container.

Author: boomanaiden154

.github/workflows/pr-code-format.yml

@@ -12,6 +12,8 @@ on:
 jobs:
   code_formatter:
     runs-on: ubuntu-24.04
+    container:
+      image: 'ghcr.io/llvm/ci-ubuntu-24.04-format'
     timeout-minutes: 30
     concurrency:
       group: ${{ github.workflow }}-${{ github.event.pull_request.number }}
@@ -23,6 +25,14 @@ jobs:
         with:
           fetch-depth: 2
 
+      # We need to set the repo checkout as safe, otherwise tj-actions/changed-files
+      # will fail due to the changed ownership inside the container.
+      # TODO(boomanaiden154): We should probably fix this by having the default user
+      # in the container have the same ID as the GHA user on the host.
+      - name: Set Safe Directory
+        run: |
+          chown -R root $(pwd)
+
       - name: Get changed files
         id: changed-files
         uses: tj-actions/changed-files@ed68ef82c095e0d48ec87eccea555d944a631a4c # v46.0.5
@@ -39,24 +49,6 @@ jobs:
           echo "Formatting files:"
           echo "$CHANGED_FILES"
 
-      # The clang format 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-format
-        uses: aminya/setup-cpp@a276e6e3d1db9160db5edc458e99a30d3b109949 # v1.7.1
-        with:
-          clangformat: 21.1.0
-
-      - name: Setup Python env
-        uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
-        with:
-          python-version: '3.13'
-          cache: 'pip'
-          cache-dependency-path: 'llvm/utils/git/requirements_formatting.txt'
-
-      - name: Install python dependencies
-        run: pip install -r llvm/utils/git/requirements_formatting.txt
-
       - name: Run code formatter
         env:
           GITHUB_PR_NUMBER: ${{ github.event.pull_request.number }}