create a build workflow

fixes #45

.github/workflows/build.yml

@@ -0,0 +1,42 @@
+name: Build lsfg-vk on Arch Linux
+on: [push]
+
+jobs:
+  build-arch:
+    runs-on: ubuntu-latest
+    container:
+      image: archlinux:latest
+    steps:
+    - name: Prepare cache for pacman packages
+      uses: actions/cache@v4
+      with:
+        path: /var/cache/pacman/pkg
+        key: archlinux-pacman-cache
+    - name: Install build dependencies
+      run: |
+        pacman -Syu --noconfirm \
+          base-devel \
+          git sdl3 \
+          clang llvm \
+          cmake meson ninja \
+          glslang vulkan-headers vulkan-icd-loader
+    - name: Checkout repository
+      uses: actions/checkout@v4
+    - name: Configure with CMake and Ninja
+      run: |
+        cmake -B build -G Ninja \
+          -DCMAKE_BUILD_TYPE=Release \
+          -DCMAKE_INSTALL_PREFIX=./build-release
+    - name: Build with Ninja
+      run: |
+        ninja -C build
+    - name: Install with CMake
+      run: |
+        cmake --install build
+    - name: Upload lsfg-vk artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: lsfg-vk
+        path: |
+          build-release/share/vulkan/implicit_layer.d/VkLayer_LS_frame_generation.json
+          build-release/lib/liblsfg-vk.so