CI: Use "uv" to speed-up Python package installations

* Use workaround to use "uv" for Python3

ADDED:

* test-pyp27.yml: Check basic Python 2.7 support

.github/workflows/test-pypy27.yml

@@ -0,0 +1,44 @@
+# -- TEST-VARIANT: pypy-27 on ubuntu-latest
+# BASED ON: test.yml
+# DESCRIPTION: Checks for Python 2.7 support and any problems
+
+name: test-pypy27
+on:
+  workflow_dispatch:
+  push:
+    branches: [ "main", "release/**" ]
+  pull_request:
+    types: [opened, reopened, review_requested]
+    branches: [ "main" ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["pypy-2.7"]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: 'pip'
+          cache-dependency-path: 'py.requirements/*.txt'
+
+      - name: Install Python package dependencies
+        run: |
+           python -m pip install -U pip setuptools wheel
+           pip install --upgrade -r py.requirements/ci.github.testing.txt
+           pip install -e .
+      - name: Run tests
+        run: pytest
+      - name: Upload test reports
+        uses: actions/upload-artifact@v4
+        with:
+          name: test reports
+          path: |
+            build/testing/report.xml
+            build/testing/report.html
+        if: ${{ job.status == 'failure' }}
+        # MAYBE: if: ${{ always() }}

.github/workflows/test.yml

@@ -2,7 +2,7 @@
 # SEE: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
 # SUPPORTED PYTHON VERSIONS: https://github.com/actions/python-versions
 
-name: tests
+name: test
 on:
   workflow_dispatch:
   push:
@@ -35,8 +35,6 @@ jobs:
       - name: "Install Python package dependencies (with: uv)"
         run: |
           python -m pip install -U uv
-          uv --verbose pip install -U pip setuptools wheel
-          # -- WORKAROUND:
           python -m uv pip install -U pip setuptools wheel
           python -m uv pip install --upgrade -r py.requirements/ci.github.testing.txt
           python -m uv pip install -e .