cmake: do not install to opt

ci/Dockerfile

@@ -2,7 +2,7 @@ FROM debian:bookworm
 
 RUN apt update && \
     apt install -y \
-        build-essential cmake git file \
+        build-essential cmake git file tree \
         libboost-system-dev libboost-thread-dev \
         libgtest-dev googletest && \
     rm -rf /var/lib/apt/lists/*

ci/entrypoint.sh

@@ -8,3 +8,8 @@ cmake -B /libcreate/build -S /libcreate -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_F
 cmake --build /libcreate/build --config Release
 ctest -C Release --output-on-failure
 cpack --build /libcreate/build -G DEB
+
+debs=(/libcreate/_packages/*.deb)
+cp "${debs[0]}" /tmp/libcreate.deb
+dpkg-deb -R /tmp/libcreate.deb /tmp/libcreate
+tree /tmp/libcreate

cmake/Packing.cmake

@@ -13,9 +13,6 @@ set(CPACK_VERBATIM_VARIABLES YES)
 set(CPACK_PACKAGE_INSTALL_DIRECTORY ${CPACK_PACKAGE_NAME})
 SET(CPACK_OUTPUT_FILE_PREFIX "${CMAKE_SOURCE_DIR}/_packages")
 
-# https://unix.stackexchange.com/a/11552/254512
-set(CPACK_PACKAGING_INSTALL_PREFIX "/opt/some")#/${CMAKE_PROJECT_VERSION}")
-
 set(CPACK_PACKAGE_VERSION_MAJOR ${PROJECT_VERSION_MAJOR})
 set(CPACK_PACKAGE_VERSION_MINOR ${PROJECT_VERSION_MINOR})
 set(CPACK_PACKAGE_VERSION_PATCH ${PROJECT_VERSION_PATCH})
@@ -40,11 +37,5 @@ set(
 # package name for deb. If set, then instead of some-application-0.9.2-Linux.deb
 # you'll get some-application_0.9.2_amd64.deb (note the underscores too)
 set(CPACK_DEBIAN_FILE_NAME DEB-DEFAULT)
-# that is if you want every group to have its own package,
-# although the same will happen if this is not set (so it defaults to ONE_PER_GROUP)
-# and CPACK_DEB_COMPONENT_INSTALL is set to YES
-set(CPACK_COMPONENTS_GROUPING ALL_COMPONENTS_IN_ONE)#ONE_PER_GROUP)
-# without this you won't be able to pack only specified component
-set(CPACK_DEB_COMPONENT_INSTALL YES)
 
 include(CPack)