Add workflows

Author: ManifoldFR

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

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+name: Build on OSX/Linux via Pixi
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: 0 8 3 * *
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - 'doc/**'
+      - 'scripts/**'
+      - '.gitlab-ci.yml'
+      - '.gitignore'
+      - '**.md'
+      - 'CITATION.cff'
+      - 'CITATIONS.bib'
+  pull_request:
+    paths-ignore:
+      - 'doc/'
+      - 'scripts/'
+      - '.gitlab-ci.yml'
+      - '.gitignore'
+      - '**.md'
+      - 'CITATION.cff'
+      - 'CITATIONS.bib'
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  aligator-example-pixi:
+    name: ${{ matrix.os }} - Env ${{ matrix.environment }} ${{ matrix.build_type }}
+    runs-on: ${{ matrix.os }}
+    env:
+      CCACHE_BASEDIR: "${GITHUB_WORKSPACE}"
+      CCACHE_DIR: "${GITHUB_WORKSPACE}/.ccache"
+      CCACHE_COMPRESS: true
+      CCACHE_COMPRESSLEVEL: 6
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, macos-13]
+        environment: [default]
+        build_type: [Release, Debug]
+
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        submodules: recursive
+
+    - uses: actions/cache@v4
+      with:
+        path: .ccache
+        key: ccache-macos-linux-pixi-${{ matrix.os }}-${{ matrix.build_type }}-${{ github.sha }}
+        restore-keys: ccache-macos-linux-pixi-${{ matrix.os }}-${{ matrix.build_type }}-
+
+    - uses: prefix-dev/[email protected]
+      with:
+        cache: true
+        environments: ${{ matrix.environment }}
+
+    - name: Build aligator-cmake-example-project
+      shell: bash -l {0}
+      env:
+        CMAKE_BUILD_PARALLEL_LEVEL: 4
+        ALCEP_BUILD_TYPE: ${{ matrix.build_type }}
+      run: |
+        pixi run -e ${{ matrix.environment }} build
+
+  check:
+    name: check-macos-linux-pixi
+
+    needs:
+    - aligator-example-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) }}

.github/workflows/update_pixi_lockfile.yml

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+name: CI - Update Pixi lockfile
+permissions:
+  contents: write
+  pull-requests: write
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: 0 5 1 * *
+
+jobs:
+  pixi-update:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/create-github-app-token@v1
+        id: generate-token
+        with:
+          app-id: ${{ secrets.APP_ID }}
+          private-key: ${{ secrets.APP_PRIVATE_KEY }}
+
+      - uses: actions/checkout@v4
+        with:
+          token: ${{ steps.generate-token.outputs.token }}
+          # Make sure the value of GITHUB_TOKEN will not be persisted in repo's config
+          persist-credentials: false
+
+      - name: Set up pixi
+        uses: prefix-dev/[email protected]
+        with:
+          run-install: false
+
+      - name: Update lockfile
+        run: |
+          set -o pipefail
+          pixi update --json | pixi exec pixi-diff-to-markdown >> diff.md
+
+      - name: Create pull request
+        uses: peter-evans/create-pull-request@v7
+        with:
+          token: ${{ steps.generate-token.outputs.token }}
+          commit-message: 'pixi: Update pixi lockfile'
+          title: Update pixi lockfile
+          body-path: diff.md
+          branch: topic/update-pixi
+          base: main
+          labels: pixi
+          delete-branch: true
+          add-paths: pixi.lock