Convert cirrus to gha

.github/workflows/ci-tests.yml

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+# reference:
+#   - https://github.com/actions/cache
+#   - https://github.com/actions/checkout
+#   - https://github.com/marketplace/actions/setup-miniconda
+
+name: ci-tests
+
+on:
+  push:
+    branches:
+      - "main"
+      - "v*x"
+    tags:
+      - "v*"
+  pull_request:
+    branches:
+      - "*"
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  tests:
+    name: "${{ matrix.session }} (py${{ matrix.python-version }} ${{ matrix.os }}) [${{ matrix.iris-source }}]"
+
+    runs-on: ${{ matrix.os }}
+
+    defaults:
+      run:
+        shell: bash -l {0}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os: ["ubuntu-latest"]
+        python-version: ["3.11"]
+        session: ["doctest"]
+        # conda-forge doesn't fit within nose char limits, change with pytest
+        iris-source : ["condaforge"]
+        include:
+          - os: "ubuntu-latest"
+            python-version: "3.11"
+            session: "tests"
+            iris-source: "condaforge"
+          - os: "ubuntu-latest"
+            python-version: "3.11"
+            session: "tests"
+            iris-source: "source"
+          - os: "ubuntu-latest"
+            python-version: "3.10"
+            session: "tests"
+            iris-source: "condaforge"
+          - os: "ubuntu-latest"
+            python-version: "3.9"
+            session: "tests"
+            iris-source: "condaforge"
+
+    env:
+      IRIS_TEST_DATA_VERSION: "2.24"
+      ENV_NAME: "ci-tests"
+
+    steps:
+      - name: "checkout"
+        uses: actions/checkout@v4
+
+      - name: "environment configure"
+        env:
+          # Maximum cache period (in weeks) before forcing a cache refresh.
+          CACHE_WEEKS: 2
+        run: |
+          echo "CACHE_PERIOD=$(date +%Y).$(expr $(date +%U) / ${CACHE_WEEKS})" >> ${GITHUB_ENV}
+          echo "LOCK_FILE=requirements/locks/py$(echo ${{ matrix.python-version }} | tr -d '.')-linux-64.lock" >> ${GITHUB_ENV}
+
+      - name: "data cache"
+        uses: ./.github/workflows/composite/iris-data-cache
+        with:
+          cache_build: 0
+          env_name: ${{ env.ENV_NAME }}
+          version: ${{ env.IRIS_TEST_DATA_VERSION }}
+
+      - name: "conda package cache"
+        uses: ./.github/workflows/composite/conda-pkg-cache
+        with:
+          cache_build: 0
+          cache_period: ${{ env.CACHE_PERIOD }}
+          env_name: ${{ env.ENV_NAME }}
+
+      - name: "conda install"
+        uses: conda-incubator/setup-miniconda@v3
+        with:
+          miniforge-version: latest
+          channels: conda-forge,defaults
+          activate-environment: ${{ env.ENV_NAME }}
+          auto-update-conda: false
+          use-only-tar-bz2: true
+
+      - name: "conda environment cache"
+        uses: ./.github/workflows/composite/conda-env-cache
+        with:
+          cache_build: 0
+          cache_period: ${{ env.CACHE_PERIOD }}
+          env_name: ${{ env.ENV_NAME }}
+          install_packages: "cartopy nox pip"
+
+      - name: "conda info"
+        run: |
+          conda info
+          conda list
+
+      - name: "cartopy cache"
+        uses: ./.github/workflows/composite/cartopy-cache
+        with:
+          cache_build: 0
+          cache_period: ${{ env.CACHE_PERIOD }}
+          env_name: ${{ env.ENV_NAME }}
+
+      - name: "nox cache"
+        uses: ./.github/workflows/composite/nox-cache
+        with:
+          cache_build: 0
+          env_name: ${{ env.ENV_NAME }}
+          lock_file: ${{ env.LOCK_FILE }}
+
+      - name: "iris ${{ matrix.session }}"
+        env:
+          PY_VER: ${{ matrix.python-version }}
+          IRIS_SOURCE: ${{ matrix.iris-source }}
+#          IRIS_TEST_DATA_DIR: ${HOME}/iris-test-data
+        run: |
+          nox --session ${{ matrix.session }} -- --test-data-dir ${HOME}/iris-test-data/test_data

.github/workflows/composite/cartopy-cache/action.yml

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+name: "cartopy-cache"
+description: "create and cache cartopy assets"
+
+#
+# Assumes the environment contains the following variables:
+#   - CONDA
+#
+inputs:
+  cache_build:
+    description: "conda environment cache build number"
+    required: false
+    default: "0"
+  cache_period:
+    description: "conda environment cache timestamp"
+    required: true
+  env_name:
+    description: "environment name"
+    required: true
+
+runs:
+  using: "composite"
+  steps:
+    - uses: actions/cache@v3
+      id: cartopy-cache
+      with:
+        path: ~/.local/share/cartopy
+        key: ${{ runner.os }}-cartopy-${{ inputs.env_name }}-p${{ inputs.cache_period }}-b${{ inputs.cache_build }}
+
+    - if: steps.cartopy-cache.outputs.cache-hit != 'true'
+      env:
+        CARTOPY_SHARE_DIR: ~/.local/share/cartopy
+        CARTOPY_FEATURE: https://raw.githubusercontent.com/SciTools/cartopy/v0.20.0/tools/cartopy_feature_download.py
+      shell: bash
+      run: |
+        # Require to explicitly activate the environment within the composite action.
+        source ${{ env.CONDA }}/etc/profile.d/conda.sh >/dev/null 2>&1
+        conda activate ${{ inputs.env_name }}
+        wget --quiet ${CARTOPY_FEATURE}
+        mkdir -p ${CARTOPY_SHARE_DIR}
+        # Requires a pre-installed version of cartopy within the environment.
+        python cartopy_feature_download.py physical --output ${CARTOPY_SHARE_DIR} --no-warn

.github/workflows/composite/conda-env-cache/action.yml

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+name: "conda-env-cache"
+description: "create and cache the conda environment"
+
+#
+# Assumes the environment contains the following variables:
+#   - CONDA
+#
+inputs:
+  cache_build:
+    description: "conda environment cache build number"
+    required: false
+    default: "0"
+  cache_period:
+    description: "conda environment cache timestamp"
+    required: true
+  env_name:
+    description: "environment name"
+    required: true
+  install_packages:
+    description: "conda packages to install into environment"
+    required: true
+
+runs:
+  using: "composite"
+  steps:
+    - uses: actions/cache@v3
+      id: conda-env-cache
+      with:
+        path: ${{ env.CONDA }}/envs/${{ inputs.env_name }}
+        key: ${{ runner.os }}-conda-env-${{ inputs.env_name }}-p${{ inputs.cache_period }}-b${{ inputs.cache_build }}
+
+    - if: steps.conda-env-cache.outputs.cache-hit != 'true'
+      shell: bash
+      run: |
+        conda install --quiet --name ${{ inputs.env_name }} ${{ inputs.install_packages }}

.github/workflows/composite/conda-pkg-cache/action.yml

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+name: "conda-pkg-cache"
+description: "cache the conda environment packages"
+
+inputs:
+  cache_build:
+    description: "conda environment cache build number"
+    required: false
+    default: "0"
+  cache_period:
+    description: "conda environment cache timestamp"
+    required: true
+  env_name:
+    description: "environment name"
+    required: true
+
+runs:
+  using: "composite"
+  steps:
+    - uses: actions/cache@v3
+      with:
+        path: ~/conda_pkgs_dir
+        key: ${{ runner.os }}-conda-pkgs-${{ inputs.env_name }}-p${{ inputs.cache_period }}-b${{ inputs.cache_build }}