build.yml: MSYS2 GitHub Action disable ccache and enable

You need to disable the msys2 cache from the GitHub action because we moved the Scheduled Merge Jobs to a new NuttX Mirror Repo and approaching total cache storage limit !!!

https://github.com/apache/nuttx/actions/caches

https://github.com/msys2/setup-msys2?tab=readme-ov-file#cache

Enable CMake+Ninja for Msys2

.github/workflows/build.yml

@@ -278,6 +278,7 @@ jobs:
         with:
           msystem: MSYS
           update: false
+          cache: false
           install: >-
             base-devel
             gcc
@@ -322,7 +323,7 @@ jobs:
           git config --global --add safe.directory /github/workspace/sources/nuttx
           git config --global --add safe.directory /github/workspace/sources/apps
           cd sources/nuttx/tools/ci
-          ./cibuild.sh -g -i -A -C -R testlist/${{matrix.boards}}.dat
+          ./cibuild.sh -g -i -A -C -N -R testlist/${{matrix.boards}}.dat
 
       - uses: actions/upload-artifact@v4
         with: