Describe the bug

Cannot load status db when filesystem is readonly

vcpkg list
error writing file: C:\vcpkg\installed\vcpkg\status-new: The data is invalid.

Environment

• OS: Windows 10 x64
• Compiler: MSVC 2019

To Reproduce
Steps to reproduce the behavior:

1. Perform vcpkg operation in a writable filesystem
2. vcpkg install zlib
3. Make filesystem readonly (you may also deny NTFS write permission)
4. vcpkg list
5. Error occur

Expected behavior
No error.
zlib:x64-windows 1.2.11-6 A compression library

Additional context
If C:\vcpkg\installed\vcpkg\status is written immediately before vcpkg install exits, instead of lazy write on subsequent load, it won't fail on a readonly filesystem.

vcpkg update and vcpkg upgrade also fail.

If you run vcpkg list once then make readonly, subsequent vcpkg list will succeed.