Add python 2 to Ubuntu build matrix.

Author: stefanseefeld

.github/workflows/test-ubuntu.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.14']
+        python-version: ['2.7', '3.14']
         cxx: [g++, clang++]
         std: [c++11, c++14, c++17]
         include:
@@ -34,6 +34,7 @@ jobs:
     steps:
     - uses: actions/checkout@v5
     - name: setup python
+      if: "${{ matrix.python-version  != '2.7' }}"
       uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}