add actions build yml

.github/workflows/build.yml

@@ -0,0 +1,55 @@
+name: build
+on: [push]
+jobs:
+  build:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: actions/cache@v3
+        with:
+          path: skiasharp/externals/skia/third_party
+          key: ${{ runner.os }}-skia-third_party-cache
+      - uses: actions/cache@v3
+        with:
+          path: skiasharp/external/skia/out/windows/x64/obj
+          key: ${{ runner.os }}-skia-build-cache
+
+      - name: Clone source
+        working-directory: ${{github.workspace}}
+        shell: pwsh
+        run: |
+          mkdir -p skiasharp && cd skiasharp
+          git init && git remote add origin https://github.com/mono/SkiaSharp.git
+          git fetch --depth 1 origin release/2.88.6
+          git checkout --recurse-submodules -q FETCH_HEAD
+          git submodule update --init --depth 1
+
+      - name: Prepare build skia
+        working-directory: ${{github.workspace}}
+        shell: pwsh
+        run: |
+          cd skiasharp\external\skia
+          python tools\git-sync-deps
+          python ..\depot_tools\gn.py gen .\out\windows\x64\
+
+      - uses: microsoft/[email protected]
+      - name: Build skia
+        working-directory: ${{github.workspace}}
+        run: |
+          cp args.gn skiasharp\external\skia\out\windows\x64\
+          cd skiasharp\external\skia
+          ..\depot_tools\ninja -C .\out\windows\x64\ SkiaSharp
+          cd .\out\windows\x64\
+          lib.exe /OUT:libSkiaSharp.lib *.lib
+
+      - name: Package libSkiaSharp
+        working-directory: ${{github.workspace}}
+        run: |
+          cd skiasharp\external\skia\out\windows\x64\
+          7z a -y -mx9 libSkiaSharp.7z ./libSkiaSharp.lib
+
+      - uses: actions/upload-artifact@v3
+        with:
+          name: libSkiaSharp
+          path: skiasharp/external/skia/out/windows/x64/libSkiaSharp.7z