Add draft build workflow

Author: saltedlolly

.github/workflows/build-cpp.yml

@@ -0,0 +1,38 @@
+name: Build and Release C++ Binaries for ARM64 and x86_64
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+          - architecture: amd64
+            target: x86_64-linux-gnu
+          - architecture: arm64
+            target: aarch64-linux-gnu
+    steps:
+      - uses: actions/checkout@v3
+      
+      - name: Install Dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y g++-aarch64-linux-gnu gcc-aarch64-linux-gnu
+          sudo apt-get install -y g++-multilib gcc-multilib
+          sudo apt-get install -y build-essential libcurl4-openssl-dev libjson-c-dev
+
+      - name: Build
+        run: |
+          make ARCH=${{ matrix.architecture }}
+        env:
+          CC: ${{ matrix.target }}-gcc
+          CXX: ${{ matrix.target }}-g++
+      
+      - name: Upload Artifact
+        uses: actions/upload-artifact@v2
+        with:
+          name: dgnsm-${{ matrix.architecture }}
+          path: path/to/your/binary