[cicd] rewrite recipe to use conda-incubator/setup-miniconda@v3

.github/workflows/python-package-conda.yml

@@ -3,37 +3,20 @@ name: conda build
 on: [ push ]
 
 jobs:
-  build:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os:
-          - ubuntu-latest
-          - windows-latest
-          - macos-latest
+  linux:
+    runs-on: "ubuntu-latest"
     steps:
-      - uses: actions/checkout@v3
-      - name: Set up Python 3.10
-        uses: actions/setup-python@v3
+      - uses: actions/checkout@v4
+      - uses: conda-incubator/setup-miniconda@v3
         with:
+          miniconda-version: "latest"
           python-version: '3.10'
-      - name: Set paths and variables windows
-        if: startsWith(matrix.os, 'windows')
-        run: |
-          echo "$env:CONDA\condabin" | Out-File -FilePath $env:GITHUB_PATH -Append
-          echo "$env:CONDA\Scripts" | Out-File -FilePath $env:GITHUB_PATH -Append
-          echo "$env:CONDA\Library\bin" | Out-File -FilePath $env:GITHUB_PATH -Append
-          echo "PROJ_DATA=$env:CONDA\Library\share\proj" | Out-File -FilePath $env:GITHUB_ENV -Append
+          environment-file: environment.yml
+          shell: bash -el {0}
       - name: Set paths and variables
-        if: ${{ ! startsWith(matrix.os, 'windows') }}
         run: |
-          echo "$CONDA/bin" >> $GITHUB_PATH
           echo "PROJ_DATA=$CONDA/share/proj" >> $GITHUB_ENV
-      - name: Install dependencies
-        run: |
-          conda env update --file environment.yml --name base
       - name: Lint with flake8
-        if: startsWith(matrix.os, 'ubuntu')
         run: |
           conda install flake8
           # stop the build if there are Python syntax errors or undefined names