Bump minimum Python to 3.11; use Codecov in CI

Author: pont-us

.github/workflows/tests.yaml

@@ -31,4 +31,7 @@ jobs:
     - name: Run pytest
       shell: bash -el {0}
       run: |
-        pytest
+        pytest --cov=xcengine --cov-branch --cov-report=xml
+    - uses: codecov/codecov-action@v5
+      with:
+        verbose: true

environment.yml

@@ -3,7 +3,7 @@ channels:
   - conda-forge
 dependencies:
   # Python
-  - python >=3.10
+  - python >=3.11
   # Required
   - click
   - docker-py
@@ -15,6 +15,7 @@ dependencies:
   - xcube  # See note below
   # test dependencies
   - pytest
+  - pytest-cov
 
 # Note: xcube is not required for the conversion itself, but is required
 # to run generated scripts outside containers ("create" mode).