chore: integrate vcpkg before installing sdl2

.github/workflows/main.yml

@@ -1,4 +1,4 @@
-on: [push]
+on: [push, workflow_dispatch]
 
 jobs:
   build:
@@ -21,6 +21,7 @@ jobs:
       - name: prepare-windows
         if: runner.os == 'Windows'
         run: |
+            vcpkg integrate install
             vcpkg install sdl2:x64-windows
       - name: build 
         run: zig build -Drelease-safe