💚 Change auto-merge method to MERGE in workflow

Updated the GitHub Actions workflow to use the MERGE method instead of SQUASH when enabling auto-merge for pull requests. Also generalized the step to apply to all PRs, not just Dependabot PRs.

Author: yuseok-kim-edushare

.github/workflows/auto-merge.yaml

@@ -25,14 +25,13 @@ jobs:
             echo "is_dependabot=false" >> $GITHUB_OUTPUT
           fi
           
-      - name: Enable auto-merge for dependabot PRs
-        if: steps.check_dependabot.outputs.is_dependabot == 'true'
+      - name: Enable auto-merge for PRs
         uses: actions/github-script@v7
         with:
           script: |
             await github.graphql(`
               mutation enablePullRequestAutoMerge($pullRequestId: ID!) {
-                enablePullRequestAutoMerge(input: {pullRequestId: $pullRequestId, mergeMethod: SQUASH}) {
+                enablePullRequestAutoMerge(input: {pullRequestId: $pullRequestId, mergeMethod: MERGE}) {
                   pullRequest {
                     id
                     autoMergeRequest {