WIP: ci: Add rootfs size for stability of runner

Signed-off-by: Yuya Hamamachi <yuya.hamamachi.sx@renesas.com>

Author: yhamamachi

.github/workflows/setup_build_env/action.yml

@@ -98,7 +98,7 @@ runs:
     - name: Maximize build space
       uses: easimon/maximize-build-space@master
       with:
-        root-reserve-mb: 2048
+        root-reserve-mb: 8192
         swap-size-mb: 8192
 
         remove-dotnet: 'true'