Create PR against the branch from which we checked out

Signed-off-by: Shreeya Patel <spatel@ciq.com>

Author: shreeya-patel98

.github/workflows/kernel-build-and-test-x86_64.yml

@@ -348,47 +348,84 @@ jobs:
         fi
 
     - name: Create Pull Request
-      uses: peter-evans/create-pull-request@v6
-      with:
-        token: ${{ secrets.GITHUB_TOKEN }}
-        commit-message: "Automated PR: All tests passed"
-        title: "[${{ github.ref_name }}] ${{ steps.commit_msg.outputs.commit_subject }}"
-        body: |
-          ## Summary
-          This PR has been automatically created after successful completion of all CI stages.
-
-          ## Commit Message
-          ```
-          ${{ steps.commit_msg.outputs.commit_message }}
-          ```
-
-          ## Test Results
-
-          ### ✅ Build Stage
-          - Status: Passed
-          - Build Time: ${{ steps.build_info.outputs.build_time }}
-          - Total Time: ${{ steps.build_info.outputs.total_time }}
-          - [View build logs](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }})
-
-          ### ✅ Boot Verification
-          - Status: Passed
-          - [View boot logs](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }})
-
-          ### ✅ Kernel Selftests
-          - **Passed:** ${{ steps.stats.outputs.passed }}
-          - **Failed:** ${{ steps.stats.outputs.failed }}
-          - [View kselftest logs](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }})
-
-          ### ✅ Test Comparison
-          - Comparison against previous run: Within acceptable threshold (±3 tests)
-          - Branch: ${{ github.ref_name }}
-
-          ---
-          🤖 This PR was automatically generated by GitHub Actions
-          Run ID: ${{ github.run_id }}
-        branch: pr/${{ github.ref_name }}-tested
-        delete-branch: true
-        labels: |
-          automated
-          tested
-          ready-for-review
+      env:
+        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      run: |
+        # Determine base branch from the upstream tracking branch
+        BASE_BRANCH=$(git rev-parse --abbrev-ref --symbolic-full-name @{u} 2>/dev/null | sed 's|^origin/||' || echo "")
+
+        if [ -z "$BASE_BRANCH" ]; then
+          # Fallback: use merge-base to find the common ancestor branch
+          echo "No upstream tracking branch found, using merge-base to find parent branch"
+          for branch in lts-9.2 lts-9 main master; do
+            if git rev-parse origin/$branch >/dev/null 2>&1; then
+              MERGE_BASE=$(git merge-base HEAD origin/$branch 2>/dev/null || echo "")
+              if [ -n "$MERGE_BASE" ]; then
+                BASE_BRANCH=$branch
+                echo "Found common ancestor with origin/$branch"
+                break
+              fi
+            fi
+          done
+        fi
+
+        if [ -z "$BASE_BRANCH" ]; then
+          echo "ERROR: Could not determine base branch for PR"
+          exit 1
+        fi
+
+        echo "Creating PR from ${{ github.ref_name }} to $BASE_BRANCH"
+
+        # Create PR body
+        cat > pr_body.md << 'EOF'
+        ## Summary
+        This PR has been automatically created after successful completion of all CI stages.
+
+        ## Commit Message(s)
+        ```
+        ${{ steps.commit_msg.outputs.commit_message }}
+        ```
+
+        ## Test Results
+
+        ### ✅ Build Stage
+        - Status: Passed
+        - Build Time: ${{ steps.build_info.outputs.build_time }}
+        - Total Time: ${{ steps.build_info.outputs.total_time }}
+        - [View build logs](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }})
+
+        ### ✅ Boot Verification
+        - Status: Passed
+        - [View boot logs](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }})
+
+        ### ✅ Kernel Selftests
+        - **Passed:** ${{ steps.stats.outputs.passed }}
+        - **Failed:** ${{ steps.stats.outputs.failed }}
+        - [View kselftest logs](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }})
+
+        ### ✅ Test Comparison
+        - Comparison against previous run: Within acceptable threshold (±3 tests)
+        - Branch: ${{ github.ref_name }}
+
+        ---
+        🤖 This PR was automatically generated by GitHub Actions
+        Run ID: ${{ github.run_id }}
+        EOF
+
+        # Check if PR already exists
+        EXISTING_PR=$(gh pr list --head "${{ github.ref_name }}" --base "$BASE_BRANCH" --json number --jq '.[0].number' || echo "")
+
+        if [ -n "$EXISTING_PR" ]; then
+          echo "PR #$EXISTING_PR already exists, updating it"
+          gh pr edit "$EXISTING_PR" \
+            --title "[${{ github.ref_name }}] ${{ steps.commit_msg.outputs.commit_subject }}" \
+            --body-file pr_body.md
+        else
+          echo "Creating new PR from ${{ github.ref_name }} to $BASE_BRANCH"
+          gh pr create \
+            --base "$BASE_BRANCH" \
+            --head "${{ github.ref_name }}" \
+            --title "[${{ github.ref_name }}] ${{ steps.commit_msg.outputs.commit_subject }}" \
+            --body-file pr_body.md \
+            --label "automated,tested,ready-for-review"
+        fi