ci: Update sync strategy for kernel-topic branches

Sync steps followed for kernel-topic branches:
1. Sync qcom-next
2. Merge topic branch on top of it
3. Merge PR

This fails when topic branches are rebased on latest kernel version
e.g. 6.19-rc2 and qcom-next is on older kernel e.g 6.18
Merge of topic branch to qcom-next fails.

Update the sync strategy to use automerge as below :
1. Sync kernel repository
2. Run automerge taking baseline branch of kernel-topics as baseline
3. Merge PR under test on top of it

This will ensure below
1. All changes are part of the merged branch.
2. Any dependent PR's not yet part of qcom-next will be covered here.

Signed-off-by: Salendarsingh Gaud <sgaud@qti.qualcomm.com>

Author: sgaud-quic

.github/actions/sync/action.yml

@@ -36,6 +36,7 @@ runs:
         git config --global user.name "github-actions"
         git config --global user.email "github-actions@github.com"
 
+    ###Sync steps for kernel repository###
     - name: Sync with latest changes
       if: inputs.topic_repo == 'qualcomm-linux/kernel'
       shell: bash
@@ -44,50 +45,41 @@ runs:
         git fetch origin ${{ inputs.base_branch }}
         git merge origin/${{ inputs.base_branch }}
 
-    - name: Clone repositories
-      if: inputs.topic_repo == 'qualcomm-linux/kernel-topics'
+    - name: Fetch PR
+      if: inputs.topic_repo == 'qualcomm-linux/kernel'
       shell: bash
       run: |
-        git clone https://github.com/qualcomm-linux/kernel.git
-        git clone https://github.com/qualcomm-linux/automerge.git
+        git checkout ${{ inputs.base_branch }}
+        git fetch https://github.com/qualcomm-linux/kernel.git pull/${{inputs.pr_number}}/head:pr-${{inputs.pr_number}}
+        git merge pr-${{ inputs.pr_number }} --no-commit || echo "Merge already applied or fast-forwarded"
+        if ! git diff --cached --quiet; then
+          git commit -m "Merged PR #${{ inputs.pr_number }}"
+        else
+          echo "Nothing to commit. PR may already be merged or fast-forwarded."
+        fi
 
-    - name: Create merge configuration
+    ###Sync steps for kernel-topics repository###
+    - name: Clone repositories
       if: inputs.topic_repo == 'qualcomm-linux/kernel-topics'
       shell: bash
       run: |
-        TOPIC_BRANCH=${{ inputs.base_branch }}
-        TOPIC_REPO=${{ inputs.topic_repo }}
-        cat <<EOF > merge.conf
-        baseline https://github.com/qualcomm-linux/kernel.git qcom-next
-        topic https://github.com/$TOPIC_REPO.git $TOPIC_BRANCH
-        EOF
-        echo "File 'merge.conf' created successfully."
+        git clone https://github.com/qualcomm-linux/kernel.git
+        git clone https://github.com/qualcomm-linux/automerge.git
+        git clone https://github.com/qualcomm-linux/kernel-config.git
 
-    - name: Run auto merge
+    - name: Run automerge
       if: inputs.topic_repo == 'qualcomm-linux/kernel-topics'
       shell: bash
       run: |
+        sed -i 's/kernel.git/kernel-topics.git/g' kernel-config/qcom-next.conf
+        sed -i 's/qcom-next-staging/baseline/g' kernel-config/qcom-next.conf
         cd kernel
-        ../automerge/ci-merge -f ../merge.conf -t head -n
+        ../automerge/ci-merge -f ../kernel-config/qcom-next.conf -t head -i qcom-next -c https://github.com/sgaud-quic/cache -n
 
     - name: Fetch PR
       if: inputs.topic_repo == 'qualcomm-linux/kernel-topics'
       shell: bash
       run: |
-        cd kernel
         git fetch https://github.com/${{inputs.topic_repo}}.git pull/${{inputs.pr_number}}/head:pr-${{inputs.pr_number}}
         git merge pr-${{inputs.pr_number}} --no-commit
         git commit -m "Merged PR ${{inputs.pr_number}}"
-    
-    - name: Fetch PR
-      if: inputs.topic_repo == 'qualcomm-linux/kernel'
-      shell: bash
-      run: |
-        git checkout ${{ inputs.base_branch }}
-        git fetch https://github.com/qualcomm-linux/kernel.git pull/${{inputs.pr_number}}/head:pr-${{inputs.pr_number}}
-        git merge pr-${{ inputs.pr_number }} --no-commit || echo "Merge already applied or fast-forwarded"
-        if ! git diff --cached --quiet; then
-          git commit -m "Merged PR #${{ inputs.pr_number }}"
-        else
-          echo "Nothing to commit. PR may already be merged or fast-forwarded."
-        fi