Use shared auto-merge workflow [skip ci] (#3459)

follow-up of NVIDIA/spark-rapids-common#40,
target 25.06 to have some sanity check after merge as workflow update
only

1. Migrated automerge strategy to the share action in the common repo
2. Removed deprecated script in JNI repo

This has been verified in forked repo, I will do post verification after
merge and revert this change is any issue

Signed-off-by: Peixin Li <[email protected]>

Author: pxLi

.github/workflows/action-helper/python/auto-merge

@@ -1,4 +1,4 @@
-# Copyright (c) 2022-2024, NVIDIA CORPORATION.
+# Copyright (c) 2022-2025, NVIDIA CORPORATION.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -22,78 +22,13 @@ on:
     types: [closed]
 
 jobs:
-  auto-merge: # TODO: use spark-rapids-common shared action when available
+  auto-merge:
     if: github.event.pull_request.merged == true
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: set HEAD ENV
-        run: echo "HEAD=${{ github.event.pull_request.base.ref }}" >> $GITHUB_ENV
-
-      - name: Generate target branch
-        run: |
-          current_branch="${{ env.HEAD }}"
-          version=${current_branch#branch-}
-
-          IFS='.' read -r -a parts <<< "$version"
-          year=${parts[0]}
-          month=${parts[1]}
-          month=$((10#$month + 2))
-          if [ $month -gt 12 ]; then
-            month=$((month - 12))
-            year=$((year + 1))
-          fi
-
-          next_release=$(printf "%02d.%02d" $year $month)
-          echo "Next release is $next_release"
-          echo "BASE=branch-$next_release" >> $GITHUB_ENV
-
-      - name: Check if target branch exists
-        run: |
-          CODE=$(curl -s -o /dev/null -w "%{http_code}" -H "Authorization: token ${{ secrets.AUTOMERGE_TOKEN }}" \
-            https://api.github.com/repos/${{ github.repository }}/branches/${{ env.BASE }})
-          echo "Response code: $CODE..."
-
-          if [ $CODE -eq 200 ]; then
-            echo "branch_exists=true" >> $GITHUB_ENV
-          else
-            echo "branch_exists=false" >> $GITHUB_ENV
-            echo "Failed to find ${{ env.BASE }}. Skip auto-merge..."
-          fi
-
-      - uses: actions/checkout@v4
-        if: env.branch_exists == 'true'
-        with:
-          ref: ${{ env.HEAD }} # force to fetch from latest upstream instead of PR ref
-          token: ${{ secrets.AUTOMERGE_TOKEN }} # workaround auto-merge token to avoid GITHUB_TOKEN insufficient permission
-
-      - name: push intermediate branch for auto-merge
-        if: env.branch_exists == 'true'
-        run: |
-          git config user.name "spark-rapids automation"
-          git config user.email "[email protected] "
-          git fetch origin ${HEAD} ${BASE}
-          git checkout -b ${INTERMEDIATE_HEAD} origin/${HEAD}
-          # Sync the $BASE branch with the commits from the $HEAD branch,
-          # excluding the paths defined as $FILE_USE_BASE (located under ./thirdparty).
-          git checkout origin/${BASE} -- ${FILE_USE_BASE}
-          # If any submodule file is updated in the HEAD branch,
-          # always change it to the corresponding one from the BASE branch.
-          [ ! -z "$(git status --porcelain=v1 --untracked=no)" ] && \
-            git commit -s -am "Auto-merge use ${BASE} versions"
-          git push origin ${INTERMEDIATE_HEAD} -f
-        env:
-          INTERMEDIATE_HEAD: bot-auto-merge-${{ env.HEAD }}
-          FILE_USE_BASE: thirdparty/cudf thirdparty/cudf-pins
-
-      - name: auto-merge job
-        if: env.branch_exists == 'true'
-        uses: ./.github/workflows/action-helper
-        with:
-          operator: auto-merge
-        env:
-          OWNER: NVIDIA
-          REPO: spark-rapids-jni
-          HEAD: bot-auto-merge-${{ env.HEAD }}
-          BASE: ${{ env.BASE }}
-          TOKEN: ${{ secrets.AUTOMERGE_TOKEN }}
+    uses: NVIDIA/spark-rapids-common/.github/workflows/auto-merge.yml@main
+    with:
+      owner: ${{ github.repository_owner }}
+      repo: spark-rapids-jni
+      branch: ${{ github.event.pull_request.base.ref }}
+      file_use_base: 'thirdparty/cudf thirdparty/cudf-pins'
+    secrets:
+      token: ${{ secrets.AUTOMERGE_TOKEN }}