Migrate to using pixi for CI and development

conda/meta.yaml

-# SPDX-FileCopyrightText: Copyright © 2022 Idiap Research Institute <contact@idiap.ch>
-#
-# SPDX-License-Identifier: BSD-3-Clause
-
-{% set data = load_file_data(RECIPE_DIR + '/../pyproject.toml') %}
-
-package:
-  name: {{ data['project']['name'] }}
-  version: {{ environ.get('PACKAGE_VERSION', environ.get('GIT_DESCRIBE_TAG')) }}
-
-source:
-  path: ..
-
-build:
-  noarch: python
-  number: {{ environ.get('NEXT_BUILD_NUMBER', 0) }}
-  run_exports:
-    - {{ pin_subpackage(data['project']['name']) }}
-  script:
-    - "{{ PYTHON }} -m pip install {{ SRC_DIR }} -vv"
-
-requirements:
-  host:
-    - python >=3.10
-    - pip
-    - hatchling
-    - versioningit
-    - click >=8
-    - click {{ click }}
-    - tomli {{ tomli }}
-    - tomli-w {{ tomli_w }}
-    - xdg {{ xdg }}
-  run:
-    - python >=3.10
-    - {{ pin_compatible('click') }}
-    - {{ pin_compatible('tomli') }}
-    - {{ pin_compatible('tomli-w') }}
-    - {{ pin_compatible('xdg') }}
-
-test:
-  source_files:
-    - tests
-  imports:
-    - {{ data['project']['name'] }}
-  commands:
-    - pytest -sv tests
-  requires:
-    - pytest {{ pytest }}
-
-about:
-  home: {{ data['project']['urls']['homepage'] }}
-  summary: {{ data['project']['description'] }}
-  license: {{ data['project']['license'] }}
-  license_family: BSD