fix: ci ccache in chroot needs permissions

Author: jaromil

.github/workflows/main.yml

@@ -60,6 +60,10 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
+      - name: prepare ccache in alpine chroot
+        run: |
+          sudo mkdir -p /alpine/root/.cache/ccache
+          sudo chmod -R a+rw /alpine/root/.cache
       - name: ccache
         uses: hendrikmuhs/ccache-action@v1.2
       - name: Build chroot ${{ matrix.target }}