ci: Future-proof tested Python versions

.github/workflows/build.yaml

@@ -2,6 +2,7 @@ name: Build
 
 on:
   push:
+    tags: ["*"]
 
 jobs:
   build:
@@ -17,7 +18,6 @@ jobs:
 
   publish:
     name: Publish to PyPI
-    if: startsWith(github.ref, 'refs/tags/')
     runs-on: ubuntu-24.04
     needs: [build]
     environment:

.github/workflows/ci.yaml

@@ -18,47 +18,56 @@ env:
   FORCE_COLOR: 1
 
 jobs:
+  build-package:
+    name: Build & verify package
+    runs-on: ubuntu-latest
+    outputs:
+      supported-python-versions: ${{ steps.baipp.outputs.supported_python_classifiers_json_array }}
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          fetch-depth: 0
+          persist-credentials: false
+
+      - uses: hynek/build-and-inspect-python-package@efb823f52190ad02594531168b7a2d5790e66516 # v2.14.0
+        id: baipp
+
   actionlint:
+    name: Static analysis of GitHub Actions
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout code
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: reviewdog/action-actionlint@0d952c597ef8459f634d7145b0b044a9699e5e43 # v1.71.0
 
-      - name: Run actionlint
-        uses: reviewdog/action-actionlint@0d952c597ef8459f634d7145b0b044a9699e5e43 # v1.71.0
+  lint:
+    name: Static analysis of code
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: astral-sh/setup-uv@eac588ad8def6316056a12d4907a9d4d84ff7a3b # v7.3.0
+      - name: Install tox
+        run: uv tool install --with tox-uv tox
+      - name: Type checks
+        run: tox -e typing
+      - name: Lint code
+        run: tox -e lint
 
   test:
     name: Python ${{ matrix.python-version }}
     runs-on: ${{ matrix.os }}
+    needs: build-package
     strategy:
       fail-fast: false
       matrix:
         os: [ubuntu-24.04]
-        python-version:
-        - "3.8"
-        - "3.9"
-        - "3.10"
-        - "3.11"
-        - "3.12"
-        - "3.13"
-        - "3.14"
-        - "3.15"
+        python-version: ${{ fromJson(needs.build-package.outputs.supported-python-versions) }}
     steps:
-      - name: Checkout code
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-
-      - name: Set up Python
-        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
-        with:
-          python-version: ${{ matrix.python-version }}
-          allow-prereleases: true
-
-      - name: Install uv
-        uses: astral-sh/setup-uv@eac588ad8def6316056a12d4907a9d4d84ff7a3b # v7.3.0
-
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: astral-sh/setup-uv@eac588ad8def6316056a12d4907a9d4d84ff7a3b # v7.3.0
       - name: Run tests
-        run: uvx --with tox-gh --with tox-uv tox
-
+        env:
+          PYTHON: ${{ matrix.python-version }}
+        run: uvx --with tox-uv tox -e "$PYTHON"
       - name: Upload coverage data
         uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
         with:
@@ -71,20 +80,11 @@ jobs:
     runs-on: ubuntu-latest
     needs: test
     steps:
-      - name: Checkout code
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-
-      - name: Download coverage data
-        uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7.0.0
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7.0.0
         with:
           pattern: coverage-data-*
           merge-multiple: true
-
-      - name: Set up Python
-        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
-
-      - name: Install uv
-        uses: astral-sh/setup-uv@eac588ad8def6316056a12d4907a9d4d84ff7a3b # v7.3.0
-
+      - uses: astral-sh/setup-uv@eac588ad8def6316056a12d4907a9d4d84ff7a3b # v7.3.0
       - name: Combine coverage data and generate report
         run: uvx --with tox-uv tox -e coverage

pyproject.toml

@@ -15,7 +15,6 @@ keywords = [
 classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Intended Audience :: Developers",
-    "License :: OSI Approved :: MIT License",
     "Natural Language :: English",
     "Operating System :: OS Independent",
     "Programming Language :: Python",
@@ -74,18 +73,13 @@ include = ["backoff", "tests"]
 include = ["backoff"]
 
 [tool.tox]
-min_version = "4.22"
-requires = [ "tox", "tox-gh", "tox-uv" ]
+min_version = "4.43"
+requires = [ "tox>=4.43", "tox-uv" ]
 env_list = [
   "format",
-  "3.8",
-  "3.9",
-  "3.10",
-  "3.11",
-  "3.12",
-  "3.13",
-  "3.14",
-  "3.15",
+  { product = [
+    { prefix = "3.", start = 8 },
+  ] },
   "coverage",
   "lint",
   "typing",
@@ -102,16 +96,7 @@ commands = [
 
 [tool.tox.env.coverage]
 description = "generate coverage report"
-depends = [
-  "3.8",
-  "3.9",
-  "3.10",
-  "3.11",
-  "3.12",
-  "3.13",
-  "3.14",
-  "3.15",
-]
+depends = ["3.*"]
 dependency_groups = [ "test" ]
 commands = [
   [ "coverage", "combine" ],
@@ -131,7 +116,12 @@ commands = [
 description = "lint code"
 dependency_groups = [ "lint" ]
 commands = [
-    [ "ruff", "check", { replace = "posargs", default = [ "backoff", "tests", "docs" ], extend = true } ],
+    [
+      "ruff",
+      "check",
+      { replace = "if", condition = "env.GITHUB_ACTIONS == 'true'", then = ["--output-format=github"], extend = true },
+      { replace = "posargs", default = [ "backoff", "tests", "docs" ], extend = true },
+    ],
 ]
 
 [tool.tox.env.typing]
@@ -155,16 +145,6 @@ commands = [
     [ "zensical", { replace = "posargs", default = [ "build" ], extend = true } ],
 ]
 
-[tool.tox.gh.python]
-"3.15" = ["3.15"]
-"3.14" = ["3.14", "lint", "typing"]
-"3.13" = ["3.13"]
-"3.12" = ["3.12"]
-"3.11" = ["3.11"]
-"3.10" = ["3.10"]
-"3.9" = ["3.9"]
-"3.8" = ["3.8"]
-
 [tool.pytest.ini_options]
 filterwarnings = [
     "error",
@@ -181,7 +161,6 @@ extend-include = ["docs/**/*.md"]
 line-length = 88
 preview = true
 required-version = ">=0.15.2"
-target-version = "py38"
 
 [tool.ruff.format]
 docstring-code-format = true