chore: use conda setup action

.github/workflows/ci.yml

@@ -77,25 +77,22 @@ jobs:
           - "3.12"
     needs: linting
     steps:
+      - name: Setup conda
+        uses: conda-incubator/setup-miniconda@v3
+        with:
+          auto-update-conda: true
+          python-version: ${{ matrix.python-version }}
+          environment-file: environment.yml
       - name: Install Python via conda
         uses: s-weigand/setup-conda@v1
         with:
           python-version: ${{ matrix.python-version }}
-          conda-channels: defaults,bioconda,conda-forge
+          channels: conda-forge,bioconda,nodefaults
       - name: Checkout repository
         uses: actions/checkout@v4
         with:
           lfs: true
           fetch-depth: 2
-      - name: Install mamba
-        run: conda install -y mamba>=1.0.0
-      - name: Prepare environment.yml file
-        run: >
-          cp environment.yml /tmp/environment.yml && sed -i -e
-          's/- python=.*/- python=${{ matrix.python-version }}/'
-          /tmp/environment.yml
-      - name: Update environment using mamba
-        run: mamba env update --name root --file /tmp/environment.yml
       - name: Fail early on htslib etc. problems
         run: |
           set -euo pipefail