Ubuntu 20.04 GitHub Actions CI with apt dependencies on GHA images (not vanilla docker) fails

[traversaro]

Error:

CMake Error at build/_deps/ycm-src/cmake-next/proposed/ExternalProject.cmake:3223 (_ep_parse_arguments):
  _ep_parse_arguments Function invoked with incorrect arguments for function
  named: _ep_parse_arguments
Call Stack (most recent call first):
  build/_deps/ycm-src/modules/YCMEPHelper.cmake:1051 (ExternalProject_Add)
  cmake/Buildbipedal-locomotion-framework.cmake:75 (ycm_ep_helper)
  build/_deps/ycm-src/modules/FindOrBuildPackage.cmake:205 (include)
  cmake/RobotologySuperbuildLogic.cmake:124 (find_or_build_package)
  CMakeLists.txt:67 (include)

This is probably due to a CMake update of the CMake binary used by the GHA images. This is not particularly problematic as almost no users use that, but it probably indicate that we will soon have a regression somewhere else.

[traversaro]

Actually both conda and gha 20.04 apt images use 3.30, but the failure is just on gha 20.04 apt images. Probably some kind of strange interaction between:

• CMake 3.30 installed in /usr/local
• CMake 3.16 installed by apt in /usr
• Local YCM fork of ExternalProject in cmake-next/proposed/ExternalProject

I wonder if perhaps it could be the time to finally tackle robotology/ycm-cmake-modules#50 .