cmake: add CPack support for creating binary archives

.github/workflows/vmactions.yml

@@ -50,6 +50,13 @@ jobs:
         run: |
           cmake -S . -B build -GNinja \
             -Wdeprecated -Wdev -Werror \
+            -DCMAKE_BUILD_TYPE=Release \
             -DSDL_CHECK_REQUIRED_INCLUDES="/usr/local/include" \
             -DSDL_CHECK_REQUIRED_LINK_OPTIONS="-L/usr/local/lib"
-          cmake --build build --verbose -- -j`sysctl -n hw.ncpu`
+          cmake --build build/ --config Release --verbose -- -j`sysctl -n hw.ncpu`
+          cmake --build build/ --config Release --target package
+    - uses: actions/upload-artifact@v3
+      with:
+        if-no-files-found: error
+        name: SDL-freebsd
+        path: build/dist/SDL3*