Simplify cloning the repo independently.

.github/workflows/ci.yaml

@@ -288,26 +288,13 @@ jobs:
         useradd -g adm -s /bin/bash -m chevah
         echo '%adm    ALL=NOPASSWD: ALL' > /etc/sudoers
 
-    # GHA's checkout action fails on CentOS 5/6, issue same commands manually.
-    # This fails when opening a new PR, but works starting with second commit.
     - name: Clone sources independently
       run: |
         cd /home/chevah/
-        git init $CHEVAH_REPO
+        git clone https://github.com/chevah/$CHEVAH_REPO
         cd $CHEVAH_REPO
-        # Cleanup the repo.
-        git rev-parse --symbolic-full-name --verify --quiet HEAD || true
-        git rev-parse --symbolic-full-name --branches || true
-        git remote remove origin || true
-        # Update repo token.
-        git remote add origin https://github.com/chevah/$CHEVAH_REPO
-        git fetch --no-tags --prune origin
-        # Prepare the code.
-        git clean -f
-        git reset --hard ${{ github.event.after }}
-        git log -1 --format='%H'
-
-    # This action also fails on CentOS 5/6.
+        git checkout ${GITHUB_HEAD_REF}
+
     - name: Cache build
       uses: actions/cache@v4
       if: matrix.container != 'proatria/centos:5.11-chevah1' && matrix.container != 'centos:6.10'