made linter happy by removing all trailing spaces and unused imports

.github/workflows/build-pipeline.yml

@@ -1,15 +1,13 @@
-# GitHub CI build pipeline
-name:  CI build
+name: "{{ cookiecutter.project_slug }} CI build"
 
 on:
   pull_request:
-  push:
     branches:
       - master
       - main
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: "{% raw %} ${{ matrix.os }} {% endraw %}"
     env:
       PYTHONIOENCODING: "utf8"
     strategy:
@@ -19,57 +17,17 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-
-      - name: Backup pyproject.toml
-        run: cp pyproject.toml pyproject.toml.ci.bak
-
-      - name: Strip tooltip entries from pyproject.toml for CI
-        run: |
-          # Remove `tooltip = ...` from [project] and drop [project.tooltip] section if present.
-          python - <<'PY'
-          from pathlib import Path
-          p = Path('pyproject.toml')
-          text = p.read_text()
-          out_lines = []
-          cur_section = None
-          skip_section = False
-          for line in text.splitlines():
-              s = line.strip()
-              if s.startswith('[') and s.endswith(']'):
-                  cur_section = s.strip('[]')
-                  # skip any subsection that starts with project.tooltip (or exact match)
-                  if cur_section == 'project.tooltip' or cur_section.startswith('project.tooltip'):
-                      skip_section = True
-                      continue
-                  else:
-                      skip_section = False
-              if skip_section:
-                  continue
-              # drop top-level tooltip = ... when inside [project]
-              if cur_section == 'project' and s and s.split('=')[0].strip() == 'tooltip':
-                  continue
-              out_lines.append(line)
-          p.write_text('\n'.join(out_lines) + '\n')
-          PY
-
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.12
-
+          python-version: "{% raw %} ${{ matrix.python-version }} {% endraw %}"
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
           pip install .[dev]
-
       - name: Run Linting
         run: |
           ruff check .
-
       - name: Run Tests
         run: |
           pytest tests/
-
-      - name: Restore original pyproject.toml
-        if: always()
-        run: mv pyproject.toml.ci.bak pyproject.toml