ci: specify absolute path for wine prefix

Author: awaken1ng

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
           submodules: 'recursive'
 
       - run: |
-          export WINEPREFIX=.wine
+          export WINEPREFIX=${{ github.workspace }}/build/wine
           mkdir $WINEPREFIX
           cmake -B build build -DBUILD_PS2=1 -DBUILD_ARM=0 -DBOARD=waveshare-rp2040-tiny
           cmake --build build