Actions micromamba

.github/workflows/test_fast.yml

@@ -23,7 +23,7 @@ jobs:
         python-version: ['3.7', '3.8', '3.10', '3.11', '3']
         include:
           # mac os test
-          - os: 'macos-latest'
+          - os: 'macos-13'
             python-version: '3.7'  # oldest supported version
 
           # non-utc timezone test

.github/workflows/test_functional.yml

@@ -74,13 +74,13 @@ jobs:
             platform: '_remote_background_indep_tcp _remote_at_indep_tcp'
           # macos
           - name: 'macos 1/5'
-            os: 'macos-latest'
+            os: 'macos-13'
             python-version: '3.7'
             test-base: 'tests/f'
             chunk: '1/5'
             platform: '_local_background*'
           - name: 'macos 2/5'
-            os: 'macos-latest'
+            os: 'macos-13'
             python-version: '3.7'
             test-base: 'tests/f'
             chunk: '2/5'
@@ -98,11 +98,6 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Configure Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: ${{ matrix.python-version }}
-
       - name: Brew Install
         if: startsWith(matrix.os, 'macos')
         run: |
@@ -134,15 +129,26 @@ jobs:
           sudo apt-get update
           sudo apt-get install -y sqlite3 tree at
 
-      - name: Add .github/bin/ to PATH
-        # Sets up mocked mail command & any other custom executables
-        run: echo "${{ github.workspace }}/.github/bin" >> $GITHUB_PATH
+      - uses: mamba-org/setup-micromamba@v1
+        with:
+          micromamba-version: 'latest'
+          environment-file: conda-environment.yml
+          init-shell: bash
+          cache-environment: true
+          cache-environment-key: ${{ hashFiles('conda-environment.yml', 'setup.cfg', 'setup.py', 'pyproject.toml') }}${{ matrix.python-version }}${{ matrix.os }}
+          post-cleanup: 'all'
+          create-args: >-
+            python=${{ matrix.python-version }}
 
       - name: Install
         run: |
           pip install -e ."[all]"
           mkdir "$HOME/cylc-run"
 
+      - name: Add .github/bin/ to PATH
+        # Sets up mocked mail command & any other custom executables
+        run: echo "${{ github.workspace }}/.github/bin" >> $GITHUB_PATH
+
       - name: Configure Atrun
         if: contains(matrix.platform, '_local_at')
         run: |