From 1486bb5ab11edd41458bfb592b1a1de58c7b580b Mon Sep 17 00:00:00 2001
From: Oliver Sanders <oliver.sanders@metoffice.gov.uk>
Date: Mon, 6 Jan 2025 17:55:18 +0000
Subject: [PATCH] .

---
 .github/actions/create-conda-envs/action.yml | 16 ++++++----------
 .github/workflows/create-conda-envs.yml      |  2 +-
 2 files changed, 7 insertions(+), 11 deletions(-)

diff --git a/.github/actions/create-conda-envs/action.yml b/.github/actions/create-conda-envs/action.yml
index 56eb58db44..7e848f9f6b 100644
--- a/.github/actions/create-conda-envs/action.yml
+++ b/.github/actions/create-conda-envs/action.yml
@@ -29,14 +29,10 @@ runs:
         fi
         echo "CYLC_RELEASE=$CYLC_RELEASE" >> "${GITHUB_ENV}"
 
-    - shell: bash
-      working-directory: ${{ inputs.working_directory }}
-      run: |
-        # use mamba (much faster)
-        # use this when released: https://github.com/mamba-org/setup-mamba
-        conda install -n base -c conda-forge -y mamba
+    - name: setup micromamba
+      uses: mamba-org/setup-micromamba@v2
 
-    - shell: bash
+    - shell: bash -el {0}
       working-directory: ${{ inputs.working_directory }}
       run: |
         for env_file in $(echo src/reference/environments/envs/*.yml); do
@@ -50,8 +46,8 @@ runs:
             "${env_file}" \
             > "${new_env_file}"
           # create the env
-          conda run -n base mamba env create -f "${new_env_file}" -n cylc-env
+          micromamba env create -f "${new_env_file}" -n cylc-env
           # test the env
-          conda run -n cylc-env cylc version
-          conda env remove -n cylc-env
+          micromamba run -n cylc-env cylc version
+          micromamba env remove -n cylc-env
         done
diff --git a/.github/workflows/create-conda-envs.yml b/.github/workflows/create-conda-envs.yml
index 42ce7171ff..e9197bd136 100644
--- a/.github/workflows/create-conda-envs.yml
+++ b/.github/workflows/create-conda-envs.yml
@@ -24,7 +24,7 @@ jobs:
     timeout-minutes: 30
     strategy:
       matrix:
-        python: [3.7, 3.8, 3.9]
+        python: [3.8, 3.9]
     steps:
       - name: checkout cylc-doc
         uses: actions/checkout@v4