Add universal binaries to prerelease page

closes https://github.com/official-stockfish/Stockfish/pull/6744

No functional change

.github/ci/universal_matrix.json

@@ -0,0 +1,18 @@
+{
+  "config": [
+    {
+      "name": "Ubuntu 22.04 GCC Universal",
+      "os": "ubuntu-22.04",
+      "simple_name": "ubuntu",
+      "archive_ext": "tar"
+    },
+    {
+      "name": "Windows 2022 Mingw-w64 GCC Universal",
+      "os": "windows-2022",
+      "simple_name": "windows",
+      "ext": ".exe",
+      "archive_ext": "zip"
+    }
+  ],
+  "binaries": ["x86-64-universal"]
+}

.github/workflows/compilation.yml

@@ -135,11 +135,17 @@ jobs:
       - name: Check arch selection under SDE
         run: ./scripts/check_universal.sh ./stockfish-ubuntu-x86-64-universal "$SDE_DIR/sde" "$benchref"
 
+      - name: Remove non src files
+        run: git -C src clean -fx
+
       - name: Upload artifact for (pre)-release
         uses: actions/upload-artifact@v4
         with:
           name: ubuntu x86-64-universal
-          path: stockfish-ubuntu-x86-64-universal
+          path: |
+             .
+             !.git
+             !.output
 
   UniversalWindows:
     name: Windows x86-64 Universal
@@ -186,8 +192,14 @@ jobs:
       - name: Check arch selection under SDE
         run: ./scripts/check_universal.sh ./stockfish-windows-x86-64-universal.exe "$SDE_DIR/sde" "$benchref"
 
+      - name: Remove non src files
+        run: git -C src clean -fx
+
       - name: Upload artifact for (pre)-release
         uses: actions/upload-artifact@v4
         with:
           name: windows x86-64-universal
-          path: stockfish-windows-x86-64-universal.exe
+          path: |
+             .
+             !.git
+             !.output

.github/workflows/stockfish.yml

@@ -78,6 +78,7 @@ jobs:
     outputs:
       matrix: ${{ steps.set-matrix.outputs.matrix }}
       arm_matrix: ${{ steps.set-arm-matrix.outputs.arm_matrix }}
+      universal_matrix: ${{ steps.set-universal-matrix.outputs.universal_matrix }}
     steps:
       - uses: actions/checkout@v4
         with:
@@ -90,6 +91,10 @@ jobs:
         run: |
           TASKS_ARM=$(echo $(cat .github/ci/arm_matrix.json) )
           echo "ARM_MATRIX=$TASKS_ARM" >> $GITHUB_OUTPUT
+      - id: set-universal-matrix
+        run: |
+          TASKS_UNIVERSAL=$(echo $(cat .github/ci/universal_matrix.json) )
+          echo "UNIVERSAL_MATRIX=$TASKS_UNIVERSAL" >> $GITHUB_OUTPUT
   # Testing Jobs
   IWYU:
     uses: ./.github/workflows/iwyu.yml
@@ -139,3 +144,13 @@ jobs:
       contents: write # For deleting/creating a (pre)release
     secrets:
       token: ${{ secrets.GITHUB_TOKEN }}
+  Universal_Binaries:
+    if: github.repository == 'official-stockfish/Stockfish'
+    needs: [Prerelease, Matrix, Compilation]
+    uses: ./.github/workflows/upload_binaries.yml
+    with:
+      matrix: ${{ needs.Matrix.outputs.universal_matrix }}
+    permissions:
+      contents: write # For deleting/creating a (pre)release
+    secrets:
+      token: ${{ secrets.GITHUB_TOKEN }}