test: Poetry on Windows

Conda is installed on the runner by default, but we need to do
additional setup
<actions/runner-images#3477 (comment)>
to make it available on the command line.

.github/workflows/test.yml

@@ -67,6 +67,7 @@ jobs:
         runner:
           - macos-12
           - ubuntu-22.04
+          - windows-2022
         python:
           - "3.8"
           - "3.9"
@@ -77,11 +78,14 @@ jobs:
             pip-cache-dir: ~/Library/Caches/pip
           - runner: ubuntu-22.04
             pip-cache-dir: ~/.cache/pip
+          - runner: windows-2022
+            pip-cache-dir: ~\AppData\Local\pip\Cache
     steps:
       - name: Check out repository
         uses: actions/checkout@v3.3.0
 
       - name: Use Python ${{ matrix.python }}
+        id: setup-python
         uses: actions/setup-python@v4.5.0
         with:
           python-version: ${{ matrix.python }}
@@ -97,23 +101,14 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-pip-${{ secrets.CACHE_SEED }}-${{ matrix.python }}-
 
-      - name: Update package registry on Linux
-        run: sudo apt-get update
-        if: startsWith(runner.os, 'Linux')
-
-      - name: Install GDAL on Linux
-        run: sudo apt-get --assume-yes install libgdal-dev
-        if: startsWith(runner.os, 'Linux')
-
-      - name: Install GDAL on MacOS
-        run: brew install gdal
-        if: startsWith(runner.os, 'macOS')
-
-      - name: Upgrade pip
-        run: pip install --upgrade pip
+      - name: Setup Conda
+        uses: s-weigand/setup-conda@v1.1.1
+        with:
+          conda-channels: conda-forge
+          python-version: ${{ steps.setup-python.outputs.python-version }}
 
-      - name: Install Poetry
-        run: pip install poetry
+      - name: Install Conda environment packages
+        run: conda install --channel=conda-forge --quiet --yes gdal poetry
 
       - name: Install Python packages
         run: poetry install --only=main --no-root