chore(ci): change way to modified files for cppcheck

.github/workflows/cppcheck-differential.yaml

@@ -8,8 +8,14 @@ jobs:
  runs-on: ubuntu-latest
 
  steps:
- - name: Checkout code
- uses: actions/checkout@v2
+ - name: Set PR fetch depth
+ run: echo "PR_FETCH_DEPTH=$(( ${{ github.event.pull_request.commits }} + 1 ))" >> "${GITHUB_ENV}"
+
+ - name: Checkout PR branch and all PR commits
+ uses: actions/checkout@v4
+ with:
+ ref: ${{ github.event.pull_request.head.sha }}
+ fetch-depth: ${{ env.PR_FETCH_DEPTH }}
 
  - name: Install dependencies
  run: |
@@ -29,12 +35,16 @@ jobs:
  make -j $(nproc)
  sudo make install
 
+ - name: Fetch the base branch with enough history for a common merge-base commit
+ run: git fetch origin ${{ inputs.base-ref }}
+ shell: bash
+
  - name: Get changed files
  id: changed-files
  run: |
- git fetch origin ${{ github.base_ref }} --depth=1
- git diff --name-only FETCH_HEAD ${{ github.sha }} > changed_files.txt
+ git diff --name-only "origin/${{ inputs.base-ref }}"...HEAD > changed_files.txt
  cat changed_files.txt
+ shell: bash
 
  - name: Run Cppcheck on changed files
  continue-on-error: true