👷 Run tests with optional packages on Python 3.9

Making a proper build matrix now! Minimal tests (no optional dependencies) run on Python 3.8, while full tests (with all dependencies) run on Python 3.9.

Wanted to do Python 3.10 for full tests, but need to wait for rasterio 1.3.0 to come out of beta first.

.github/workflows/ci-tests.yml

@@ -19,8 +19,14 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.9"]
+        python-version: ["3.8", "3.9"]
         os: [ubuntu-22.04]
+        # Only install optional packages on Python 3.9
+        include:
+          - python-version: '3.8'
+            extra-packages: ''
+          - python-version: '3.9'
+            extra-packages: '--extras vector'
 
     steps:
       # Checkout current git repository
@@ -37,7 +43,7 @@ jobs:
       - name: Install Poetry python dependencies
         run: |
           pip install poetry==1.2.0b2
-          poetry install
+          poetry install ${{ matrix.extra-packages }}
           poetry self add poetry-dynamic-versioning-plugin
           poetry show