add release flow

Author: tomdaley92

.github/workflows/release.yml

@@ -0,0 +1,68 @@
+name: Release
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  build-macos:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Cache SDL
+        uses: actions/cache@v4
+        with:
+          path: MacOS/frameworks/sdl
+          key: sdl-macos-2.32.10-${{ runner.os }}-${{ runner.arch }}
+          restore-keys: |
+            sdl-macos-2.32.10-
+
+      - name: Install build dependencies
+        run: |
+          brew install cmake pkg-config nasm
+
+      - name: Build macOS (x86_64 + arm64)
+        run: |
+          cd MacOS
+          make
+
+      - name: Zip application bundle
+        run: zip -r -y "MacOS/release/Kiwi8-macOS.zip" "MacOS/release/Kiwi8.app"
+
+      - name: Upload to Release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: MacOS/release/Kiwi8-macOS.zip
+
+  build-windows:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Cache SDL
+        uses: actions/cache@v4
+        with:
+          path: Windows/frameworks/sdl
+          key: sdl-windows-2.32.10-${{ runner.os }}-${{ runner.arch }}
+          restore-keys: |
+            sdl-windows-2.32.10-
+
+      - name: Configures build environment for AMD64
+        uses: ilammy/msvc-dev-cmd@v1
+        with:
+            arch: amd64
+
+      - name: Build Windows (x64)
+        shell: cmd
+        run: |
+          cd Windows
+          nmake
+
+      - name: Create Zip Archive
+        run: Compress-Archive -Path Windows\release\* -DestinationPath Windows\release\Kiwi8-Windows.zip
+
+      - name: Upload to Release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: Windows\release\Kiwi8-Windows.zip