Modify build-agent-splunk workflow release step

Assisted By: claude-opus-4.6

Author: git-hyagi

.github/workflows/build-agent-splunk.yml

@@ -50,9 +50,15 @@ jobs:
         with:
           name: agent-splunk
       - name: Create GitHub Release
-        uses: softprops/action-gh-release@v2
-        with:
-          tag_name: ${{ steps.version.outputs.tag }}
-          name: agent-splunk ${{ steps.version.outputs.tag }}
-          generate_release_notes: true
-          files: agent-splunk
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          TAG="${{ steps.version.outputs.tag }}"
+          if gh release view "$TAG" > /dev/null 2>&1; then
+            gh release upload "$TAG" agent-splunk --clobber
+          else
+            gh release create "$TAG" \
+              --title "agent-splunk $TAG" \
+              --generate-notes \
+              agent-splunk
+          fi