Add GitHub Actions workflow for multi-platform builds

Author: androidprod

.github/workflows/build.yml

@@ -0,0 +1,65 @@
+name: Multi-Platform Build
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  workflow_dispatch:
+
+jobs:
+  build-windows:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Configure CMake
+        run: cmake -B build -G "Visual Studio 17 2022" -A x64
+      - name: Build
+        run: cmake --build build --config Release
+      - name: Upload Artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: SkinGetBE-Windows-x64
+          path: build/Release/SkinGetBE.exe
+
+  build-linux-x64:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Dependencies
+        run: sudo apt-get update && sudo apt-get install -y build-essential cmake
+      - name: Configure CMake
+        run: cmake -B build -DCMAKE_BUILD_TYPE=Release
+      - name: Build
+        run: cmake --build build
+      - name: Upload Artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: SkinGetBE-Linux-x64
+          path: build/SkinGetBE
+
+  build-linux-arm64:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Cross-Compiler
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y gcc-aarch64-linux-gnu g++-aarch64-linux-gnu cmake
+      - name: Create Toolchain File
+        run: |
+          cat <<EOF > arm64-toolchain.cmake
+          set(CMAKE_SYSTEM_NAME Linux)
+          set(CMAKE_SYSTEM_PROCESSOR arm)
+          set(CMAKE_C_COMPILER aarch64-linux-gnu-gcc)
+          set(CMAKE_CXX_COMPILER aarch64-linux-gnu-g++)
+          EOF
+      - name: Configure CMake
+        run: cmake -B build -DCMAKE_BUILD_TYPE=Release -DCMAKE_TOOLCHAIN_FILE=arm64-toolchain.cmake
+      - name: Build
+        run: cmake --build build
+      - name: Upload Artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: SkinGetBE-Linux-ARM64
+          path: build/SkinGetBE