Docker build broken

[systemed]

Since #555 (which fixed the MacOS build 🎉) the Docker build appears to have been broken.

This is a bit exasperating because the CI does build successfully with cmake on Ubuntu 22.04 normally, but not in Docker.

Currently it's erroring with

[100%] Linking CXX executable tilemaker
/usr/bin/ld: /usr/lib/x86_64-linux-gnu/libm-2.35.a(e_pow.o): warning: relocation against `_dl_x86_cpu_features' in read-only section `.text'
/usr/bin/ld: warning: GNU indirect functions with DT_TEXTREL may result in a segfault at runtime; recompile with -fPIE
/usr/bin/ld: /usr/lib/x86_64-linux-gnu/libm-2.35.a(s_atan.o): in function `__atan_ifunc':
(.text+0x526): undefined reference to `_dl_x86_cpu_features'
/usr/bin/ld: (.text+0x531): undefined reference to `_dl_x86_cpu_features'
/usr/bin/ld: (.text+0x53a): undefined reference to `_dl_x86_cpu_features'
/usr/bin/ld: /usr/lib/x86_64-linux-gnu/libm-2.35.a(s_floor.o): in function `__floor_ifunc':
(.text+0x6): undefined reference to `_dl_x86_cpu_features'
/usr/bin/ld: /usr/lib/x86_64-linux-gnu/libm-2.35.a(s_sin.o): in function `__sin_ifunc':
(.text+0x12c6): undefined reference to `_dl_x86_cpu_features'
/usr/bin/ld: /usr/lib/x86_64-linux-gnu/libm-2.35.a(s_sin.o):(.text+0x12d1): more undefined references to `_dl_x86_cpu_features' follow
/usr/bin/ld: warning: creating DT_TEXTREL in a PIE
collect2: error: ld returned 1 exit status
gmake[2]: *** [CMakeFiles/tilemaker.dir/build.make:425: tilemaker] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:83: CMakeFiles/tilemaker.dir/all] Error 2
gmake: *** [Makefile:136: all] Error 2

I've tried a handful of fixes (#559, #560, #561, #562) which have moved things on some way, but Docker, CMake and linking in general are beyond my comfort zone and I'm out of ideas what to try next.

If anyone with Docker skills (@leonardehrenfried @guillaumerose ?) has any ideas here that would be brilliant.

[systemed]

Fixed thanks to a suggestion from @tomhughes \o/