optimize commands to get only the branch changes

.github/workflows/mkdocs.yaml

@@ -33,17 +33,16 @@ jobs:
     - uses: actions/checkout@v2
       with:
         fetch-depth: 0
-    - name: Git Setup
+    - name: Update Gitlab Documentation
       run: |
+        LATEST_TAG=$(git rev-parse $GITHUB_REF)
+        BRANCH_NAME="documentation-ref_$LATEST_TAG"
         git config user.name ${{ secrets.GITLAB_USER }}
         git config user.email ${{ secrets.GITLAB_EMAIL }}
         git remote set-url origin ${{ secrets.GITLAB_DOC_URL }}
-    - name: Update Gitlab Documentation
-      run: |
-        LATEST_TAG=$(git describe --tags --always --abbrev=0)
-        BRANCH_NAME="documentation-ref_$LATEST_TAG"
         git checkout -b $BRANCH_NAME
         git cherry-pick -n $LATEST_TAG
+        git reset --hard HEAD
         git add \*.md docs/
         git commit --allow-empty -m "Created by $GITHUB_ACTOR"
         git push origin $BRANCH_NAME