Build step fails with "'CMAKE_BUILD_PARALLEL_LEVEL' environment variable invalid number 'all_but_one' given."

Bug Report

Summary and Bug Description

The build step of all CMake-based modules fails currently on my system (axii on latest stable and main).

Current Behavior

Example output of axii w build -nt for the robdekon project in my workspace:

Build module h2t/research_projects/robdekon/robdekon ...
Run command: cmake --build . --target all
In working directory: 
/home/christoph/Code/Cpp/ax_default/h2t/research_projects/robdekon/robdekon/build
With environment variables: CMAKE_BUILD_PARALLEL_LEVEL='all_but_one'
────────────────────────────────────────── Command output ───────────────────────────────────────────
'CMAKE_BUILD_PARALLEL_LEVEL' environment variable
invalid number 'all_but_one' given.

Usage: cmake --build <dir>             [options] [-- [native-options]]
       cmake --build --preset <preset> [options] [-- [native-options]]
Options:
  <dir>          = Project binary directory to be built.
  --preset <preset>, --preset=<preset>
                 = Specify a build preset.
  --list-presets
                 = List available build presets.
  --parallel [<jobs>], -j [<jobs>]
                 = Build in parallel using the given number of jobs. 
                   If <jobs> is omitted the native build tool's 
                   default number is used.
                   The CMAKE_BUILD_PARALLEL_LEVEL environment variable
                   specifies a default parallel level when this option
                   is not given.
  --target <tgt>..., -t <tgt>... 
                 = Build <tgt> instead of default targets.
  --config <cfg> = For multi-configuration tools, choose <cfg>.
  --clean-first  = Build target 'clean' first, then build.
                   (To clean only, use --target 'clean'.)
  --verbose, -v  = Enable verbose output - if supported - including
                   the build commands to be executed. 
  --             = Pass remaining options to the native tool.
────────────────────────────────── Command exited - Return code 1 ───────────────────────────────────
Error:  Failed to execute step 'build' on module 'h2t/research_projects/robdekon/robdekon':  Command 
exited with return code 1.

Expected Behavior

The all_but_one variable should be resolved to a concrete number.

Steps to Reproduce

axii workspace build -nt for any CMake project

Diagnosis

Output of axii self report

┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ Scope  ┃ Info                                                                ┃
┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
│ Axii   │ Axii 23.01.1.0 @stable-0 with shell integration                     │
│ OS     │ Ubuntu 18.04.6 LTS                                                  │
│ Kernel │ Linux 5.4.0-135-generic #152~18.04.2-Ubuntu SMP Tue Nov 29 08:23:49 │
│        │ UTC 2022 x86_64 GNU/Linux                                           │
│ Shell  │ /usr/bin/zsh                                                        │
│ Python │ Python 3.6.9                                                        │
│ Pip    │ attrs==22.1.0, certifi==2021.10.8, charset-normalizer==2.0.7,       │
│        │ click==8.0.0, colorama==0.4.4, commonmark==0.9.1, cycler==0.11.0,   │
│        │ dataclasses==0.8, dbus-python==1.2.18, decorator==5.1.0,            │
│        │ distro==1.7.0, docutils==0.17.1, gitdb==4.0.9, GitPython==3.1.18,   │
│        │ idna==3.3, igraph==0.9.11, importlib-metadata==4.8.3,               │
│        │ iniconfig==1.1.1, kiwisolver==1.3.1, matplotlib==3.3.0,             │
│        │ networkx==2.5, notify2==0.3.1, numpy==1.19.0, packaging==21.3,      │
│        │ Pillow==8.4.0, pkg_resources==0.0.0, pluggy==1.0.0, psutil==5.9.4,  │
│        │ py==1.11.0, Pygments==2.10.0, pygraphviz==1.6, pyparsing==3.0.6,    │
│        │ PyQt5==5.15.0, PyQt5-sip==12.9.0, pytest==7.0.1,                    │
│        │ python-dateutil==2.8.2, python-igraph==0.9.11,                      │
│        │ python-Levenshtein==0.12.2, requests==2.26.0, rich==12.6.0,         │
│        │ rich-click==1.2.1, six==1.16.0, smmap==5.0.0, texttable==1.6.4,     │
│        │ thefuzz==0.19.0, tomli==1.2.3, typing_extensions==4.1.1,            │
│        │ urllib3==1.26.7, xdg==5.1.1, zeroc-ice==3.7.0, zipp==3.6.0          │
└────────┴─────────────────────────────────────────────────────────────────────┘

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