ci: Add a workflow that use Pixi and remove conda workflow

.github/workflows/macos-linux-pixi.yml

@@ -0,0 +1,83 @@
+name: CI - OSX/Linux via Pixi
+
+on:
+  push:
+    paths-ignore:
+      - 'doc/**'
+      - 'scripts/**'
+      - '.gitlab-ci.yml'
+      - '.gitignore'
+      - '*.md'
+      - 'CHANGELOG.md'
+      - 'CITATION.cff'
+      - 'CITATIONS.bib'
+  pull_request:
+    paths-ignore:
+      - 'doc/'
+      - 'scripts/'
+      - '.gitlab-ci.yml'
+      - '.gitignore'
+      - '*.md'
+      - 'CHANGELOG.md'
+      - 'CITATION.cff'
+      - 'CITATIONS.bib'
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  aligator-pixi:
+    name: ${{ matrix.os }} - Env ${{ matrix.environment }} ${{ matrix.build_type }}
+    runs-on: ${{ matrix.os }}
+    env:
+      CCACHE_BASEDIR: "${GITHUB_WORKSPACE}"
+      CCACHE_DIR: "${GITHUB_WORKSPACE}/.ccache"
+      CCACHE_COMPRESS: true
+      CCACHE_COMPRESSLEVEL: 6
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, macos-13]
+        environment: [all, all-py39]
+        build_type: [Release, Debug]
+
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        submodules: recursive
+
+    - uses: actions/cache@v4
+      with:
+        path: .ccache
+        key: ccache-macos-linux-pixi-${{ matrix.os }}-${{ matrix.build_type }}-${{ github.sha }}
+        restore-keys: ccache-macos-linux-pixi-${{ matrix.os }}-${{ matrix.build_type }}-
+
+    - uses: prefix-dev/[email protected]
+      with:
+        pixi-version: v0.34.0
+        cache: true
+        environments: ${{ matrix.environment }}
+
+    - name: Build aligator
+      shell: bash -l {0}
+      env:
+        CMAKE_BUILD_PARALLEL_LEVEL: 4
+        ALIGATOR_BUILD_TYPE: ${{ matrix.build_type }}
+      run: |
+        pixi run -e ${{ matrix.environment }} test
+
+  check:
+    if: always()
+    name: check-macos-linux-pixi
+
+    needs:
+    - aligator-pixi
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Decide whether the needed jobs succeeded or failed
+      uses: re-actors/alls-green@release/v1
+      with:
+        jobs: ${{ toJSON(needs) }}