CPack: Create package ERROR when building Debian package

[DennisRasey]

Version, Operative system
Debian Testing (docker image debian:testing-slim).
Cherrytree 1.0.4 & latest git version

Describe the bug
I encounter the following error when trying to create a Debian package

CPack: Create package
CMake Error at /usr/share/cmake-3.27/Modules/Internal/CPack/CPackDeb.cmake:165 (message):
CPackDeb: file utility is not available. CPACK_DEBIAN_PACKAGE_SHLIBDEPS
and CPACK_DEBIAN_PACKAGE_GENERATE_SHLIBS options are not available.
Call Stack (most recent call first):
/usr/share/cmake-3.27/Modules/Internal/CPack/CPackDeb.cmake:801 (cpack_deb_prepare_package_vars)

To Reproduce

./build.sh deb

Resolution
Installing the package file appears to resolve this

apt install file