Add example openbench.yml file

Documentation/openbench.yml

@@ -0,0 +1,30 @@
+name: OpenBench Build
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  build_and_archive:
+    name: Build and Archive
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        nnue_flags: [avx2, avx512]
+        cpu_flags: [popcnt, pext]
+
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Setup Linux GCC ${{ matrix.version }}
+      uses: egor-tensin/setup-gcc@v1
+      with:
+        version: 11
+        platform: x86
+    - name: Clone Ethereal
+      uses: actions/checkout@v3
+    - name: Build Ethereal ${{ matrix.flags }}
+      run: make EVALFILE=none CC=gcc static=1 ${{ matrix.nnue_flags }}=1 ${{ matrix.cpu_flags }}=1
+    - name: Archive ${{ matrix.nnue_flags }}-${{ matrix.cpu_flags }}
+      uses: actions/upload-artifact@v3
+      with:
+        name: ${{ github.sha }}-linux-${{ matrix.nnue_flags }}-${{ matrix.cpu_flags }}
+        path: ethereal