update

Author: sumneko

.github/workflows/build.yml

@@ -28,6 +28,12 @@ jobs:
           - { os: windows-latest, target: windows, platform: win32-x64    }
     runs-on: ${{ matrix.os }}
     steps:
+      - name: Install aarch64-linux-gnu
+        if: ${{ matrix.platform == 'linux-arm64' }}
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y gcc-aarch64-linux-gnu g++-aarch64-linux-gnu
+
       - uses: actions/checkout@v2
         with:
           submodules: recursive