ci: set PYTHONPATH=src for pytest; keep Windows optional

Author: CoderDeltaLAN

.github/workflows/ci.yml

@@ -14,37 +14,35 @@ concurrency:
 
 jobs:
   linux:
-    if: ${{ (github.event_name == 'push' && startsWith(github.ref,'refs/heads/main')) || (github.event_name == 'pull_request' && github.event.pull_request.draft == false && contains(github.event.pull_request.labels.*.name,'ready')) }}
+    name: linux (py=${{ matrix.python-version }})
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
-        python-version: ['3.11','3.12']
-    name: linux (py=${{ matrix.python-version }})
+        python-version: ["3.11","3.12"]
+    env:
+      PYTHONPATH: src
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
-        with:
-          python-version: ${{ matrix.python-version }}
+        with: { python-version: ${{ matrix.python-version }} }
       - run: python -m pip install -U pip
       - run: pip install ruff black pytest mypy
       - run: ruff check .
       - run: black --check .
       - run: pytest -q
       - run: mypy .
 
-  windows:
-    if: ${{ (github.event_name == 'push' && startsWith(github.ref,'refs/heads/main')) || (github.event_name == 'pull_request' && github.event.pull_request.draft == false && contains(github.event.pull_request.labels.*.name,'ready')) }}
+  windows_optional:
+    name: windows (optional)
     runs-on: windows-latest
     continue-on-error: true
-    strategy:
-      matrix:
-        python-version: ['3.11','3.12']
-    name: windows (py=${{ matrix.python-version }})
+    env:
+      PYTHONPATH: src
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
-        with:
-          python-version: ${{ matrix.python-version }}
+        with: { python-version: "3.12" }
       - run: python -m pip install -U pip
       - run: pip install ruff black pytest mypy
       - run: ruff check .