Simplify CI definition (#111)

* Simplify CI definition

Courtesy of modern tox.

* Add Python 3.15 to CI

.github/workflows/ci.yml

@@ -33,6 +33,8 @@ jobs:
           - "pypy-3.9"
           - "pypy-3.10"
           - "pypy-3.11"
+    env:
+      PYTHON: ${{ matrix.python-version }}
 
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
@@ -45,20 +47,7 @@ jobs:
           allow-prereleases: true
           cache: pip
       - run: python -Im pip install tox
-
+      - run: python -Im tox run -e $PYTHON
-      - name: Determine Python version for tox
-        env:
-          V: ${{ matrix.python-version }}
-        run: |
-          if [[ "$V" = pypy-* ]]; then
-            V=$(echo $V | tr -d .-)
-          else
-            V=py$(echo $V | tr -d .)
-          fi
-
-          echo TOX_PYTHON=$V >>$GITHUB_ENV
-
-      - run: python -Im tox run -e $TOX_PYTHON
 
   system-package:
     runs-on: ubuntu-latest

pyproject.toml

@@ -32,6 +32,7 @@ classifiers = [
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
     "Programming Language :: Python :: 3.14",
+    "Programming Language :: Python :: 3.15",
     "Programming Language :: Python :: Free Threading",
     "Programming Language :: Python :: Implementation :: CPython",
     "Programming Language :: Python :: Implementation :: PyPy",

tox.ini

@@ -3,7 +3,8 @@ min_version = 4.25
 env_list =
     pre-commit,
     cog-{check,render},
-    py3.{9-14,14t},
+    3.{9-15},
+    3.1{4-5}t,
     pypy3.{9-11},
     system-argon2