Drop Raspbian support

[vvoland]

Docker Engine v28 was the last one to package Raspbian (32 bit).

Raspberry Pi is still supported with Debian packages.

[vvoland]

Rebased

@thaJeztah @crazy-max PTAL

[crazy-max]

Seems we have unrelated issues with fedora 44 builds? https://github.com/docker/packaging/actions/runs/22072828981/job/63781351541?pr=336#step:7:2508

[thaJeztah]

#35 25.38 CMake Error at CMakeLists.txt:1 (cmake_minimum_required):
#35 25.38   Compatibility with CMake < 3.5 has been removed from CMake.
#35 25.38 
#35 25.38   Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
#35 25.38   to tell CMake that the project requires at least <min> but has been updated
#35 25.38   to work with policies introduced by <max> or earlier.
#35 25.38 
#35 25.38   Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.

Build should be fixed now with moby/moby#52055