Switch CI to micromamba (#577)

* Switch CI to micromamba

Towards #576

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* py3.11 still causes trouble...

* pin upstream python version to <3.11

* Update whats-new.rst

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

.github/workflows/ci.yaml

@@ -9,6 +9,10 @@ on:
   schedule:
     - cron: "0 13 * * 1"
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build:
     name: Build (${{ matrix.python-version }} | ${{ matrix.os }})
@@ -25,25 +29,15 @@ jobs:
         python-version: ["3.9", "3.10"]
     steps:
       - uses: actions/checkout@v3
-      - name: Cache conda
-        uses: actions/cache@v3.0.11
-        env:
-          # Increase this value to reset cache if ci/environment.yml has not changed
-          CACHE_NUMBER: 0
-        with:
-          path: ~/conda_pkgs_dir
-          key: ${{ runner.os }}-conda-${{ env.CACHE_NUMBER }}-${{ hashFiles('ci/environment.yml') }}
-      - uses: conda-incubator/setup-miniconda@v2
+      - name: Create conda environment
+        uses: mamba-org/provision-with-micromamba@main
         with:
-          channels: conda-forge
-          mamba-version: '*'
-          channel-priority: strict
-          activate-environment: test_env_xgcm # Defined in ci/environment.yml
-          auto-update-conda: false
-          python-version: ${{ matrix.python-version }}
+          cache-downloads: true
+          micromamba-version: 'latest'
           environment-file: ci/environment.yml
-          use-only-tar-bz2: true # IMPORTANT: This needs to be set for caching to work properly!
-      - name: Set up conda environment
+          extra-specs: |
+            python=${{ matrix.python-version }}
+      - name: Install XGCM
         run: |
           python -m pip install -e . --no-deps
           conda list
@@ -69,25 +63,15 @@ jobs:
         shell: bash -l {0}
     steps:
     - uses: actions/checkout@v3
-    - name: Cache conda
-      uses: actions/cache@v3.0.11
-      env:
-        # Increase this value to reset cache if ci/environment-core-deps.yml has not changed
-        CACHE_NUMBER: 0
+    - name: Create conda environment
+      uses: mamba-org/provision-with-micromamba@main
       with:
-        path: ~/conda_pkgs_dir
-        key: ${{ runner.os }}-conda-${{ env.CACHE_NUMBER }}-${{ hashFiles('ci/environment-core-deps.yml') }}
-    - uses: conda-incubator/setup-miniconda@v2
-      with:
-        channels: conda-forge
-        mamba-version: '*'
-        channel-priority: strict
-        activate-environment: test_env_xgcm # Defined in ci/environment.yml
-        auto-update-conda: false
-        python-version: "3.10"
+        cache-downloads: true
+        micromamba-version: 'latest'
         environment-file: ci/environment-core-deps.yml
-        use-only-tar-bz2: true # IMPORTANT: This needs to be set for caching to work properly!
-    - name: Set up conda environment
+        extra-specs: |
+          python=${{ matrix.python-version }}
+    - name: Install XGCM
       run: |
         python -m pip install -e . --no-deps
         conda list
@@ -105,25 +89,15 @@ jobs:
         shell: bash -l {0}
     steps:
     - uses: actions/checkout@v3
-    - name: Cache conda
-      uses: actions/cache@v3.0.11
-      env:
-        # Increase this value to reset cache if ci/environment-upstream-dev.yml has not changed
-        CACHE_NUMBER: 0
-      with:
-        path: ~/conda_pkgs_dir
-        key: ${{ runner.os }}-conda-${{ env.CACHE_NUMBER }}-${{ hashFiles('ci/environment-upstream-dev.yml') }}
-    - uses: conda-incubator/setup-miniconda@v2
+    - name: Create conda environment
+      uses: mamba-org/provision-with-micromamba@main
       with:
-        channels: conda-forge
-        mamba-version: '*'
-        channel-priority: strict
-        activate-environment: test_env_xgcm # Defined in ci/environment.yml
-        auto-update-conda: false
-        python-version: "3.10"
+        cache-downloads: true
+        micromamba-version: 'latest'
         environment-file: ci/environment-upstream-dev.yml
-        use-only-tar-bz2: true # IMPORTANT: This needs to be set for caching to work properly!
-    - name: Set up conda environment
+        extra-specs: |
+          python=<3.11
+    - name: Install XGCM
       run: |
         python -m pip install -e . --no-deps
         conda list

doc/whats-new.rst

@@ -16,6 +16,9 @@ Breaking Changes
 
 Internal Changes
 ~~~~~~~~~~~~~~~~
+- Switch CI environment setup to micromamba (:issue:`576`, :pull:`577`).
+  By `Julius Busecke <https://github.com/jbusecke>`_.
+
 - pre-commit autoupdate frequency reduced (:pull:`563`).
   By `Julius Busecke <https://github.com/jbusecke>`_.