Added job to merge artifacts

Author: NightOwl888

.github/workflows/Lucene-Net-Performance-Regression.yml

@@ -134,7 +134,7 @@ jobs:
           
           $tempOutputDir = Join-Path $env:GITHUB_WORKSPACE "nuget-temp"
           New-Item -ItemType Directory -Force -Path $tempOutputDir | Out-Null
-          $outputDir = Join-Path $env:GITHUB_WORKSPACE "nuget"
+          $outputDir = Join-Path $env:GITHUB_WORKSPACE "nuget-subfolders" '${{ matrix.commit }}'
           New-Item -ItemType Directory -Force -Path $outputDir | Out-Null
           
           dotnet pack "./Lucene.Net.sln" `
@@ -158,10 +158,29 @@ jobs:
       - name: Upload packages
         uses: actions/upload-artifact@v4
         with:
-          name: benchmark-nupkgs
-          path: nuget/*.nupkg
+          name: nuget-subfolders
+          path: nuget-subfolders/${{ matrix.commit }}/*.nupkg
           if-no-files-found: ignore
           compression-level: 9
           retention-days: 7
           overwrite: false
 
+  merge-artifacts:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download all artifacts
+        uses: actions/download-artifact@v4
+        with:
+          pattern: nuget-subfolders*
+          merge-multiple: true
+          path: merged
+
+      - name: Upload merged artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: nuget-packages
+          path: merged
+          compression-level: 9
+          retention-days: 7
+          overwrite: true