Use baipp for matrix (#116)

* Use baipp for matrix

* Build ft

* Test latest pypy

* does this work?

* It doesn't

* Use baipp's python-version

.github/workflows/ci.yml

@@ -16,23 +16,49 @@ env:
 permissions: {}
 
 jobs:
+  build-package:
+    name: Build & verify package
+    runs-on: ubuntu-latest
+    env:
+      BUILD_PYTHON: "3.14"
+
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          submodules: recursive
+          persist-credentials: false
+      - uses: hynek/build-and-inspect-python-package@35116b25fb28e4b91149d761b2230d28ef49adc0 # v2.16.0
+        id: baipp
+        with:
+          include-free-threaded: 'true'
+          python-version:  ${{ env.BUILD_PYTHON }}
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        with:
+          cache: pip
+          python-version: ${{ env.BUILD_PYTHON }}
+
+      # Smoke-check the wheel against argon2-cffi.
+      - run: python -Im pip install $DIST/*.whl
+        env:
+          DIST: ${{ steps.baipp.outputs.dist }}
+      - run: python -Im pip install --no-deps git+https://github.com/hynek/argon2-cffi.git
+      - run: python -Im argon2 -n 1 -t 1 -m 8 -p 1
+
+    outputs:
+      # Used to define the matrix for tests below. The value is based on
+      # packaging metadata (trove classifiers).
+      python-versions: ${{ steps.baipp.outputs.supported_python_classifiers_json_array }}
+
   tests:
     name: Tests on ${{ matrix.python-version }}
+    needs: build-package
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
-        python-version:
-          - "3.9"
-          - "3.10"
-          - "3.11"
-          - "3.12"
-          - "3.13"
-          - "3.14"
-          - "3.14t"
-          - "pypy-3.9"
-          - "pypy-3.10"
-          - "pypy-3.11"
+        # Created by the build-and-inspect-python-package action above.
+        python-version: ${{ fromJson(needs.build-package.outputs.python-versions) }}
     env:
       PYTHON: ${{ matrix.python-version }}
 
@@ -49,6 +75,25 @@ jobs:
       - run: python -Im pip install tox
       - run: python -Im tox run -e $PYTHON
 
+  tests-pypy:
+    name: Tests against latest PyPy
+    runs-on: ubuntu-latest
+    env:
+      PYTHON: pypy3.11
+
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          submodules: recursive
+          persist-credentials: false
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        with:
+          python-version: ${{ env.PYTHON }}
+          allow-prereleases: true
+          cache: pip
+      - run: python -Im pip install tox
+      - run: python -Im tox run -e $PYTHON
+
   system-package:
     runs-on: ubuntu-latest
     name: Install and test with system package of Argon2
@@ -70,30 +115,6 @@ jobs:
       - run: python -Im pip install tox
       - run: python -Im tox run -e system-argon2
 
-  package:
-    name: Build & verify package
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-        with:
-          submodules: recursive
-          persist-credentials: false
-      - uses: hynek/build-and-inspect-python-package@35116b25fb28e4b91149d761b2230d28ef49adc0 # v2.16.0
-        id: baipp
-
-      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
-        with:
-          cache: pip
-          python-version: "3.x"  # use the one that baipp used
-
-      # Smoke-check the wheel against argon2-cffi.
-      - run: python -Im pip install $DIST/*.whl
-        env:
-          DIST: ${{ steps.baipp.outputs.dist }}
-      - run: python -Im pip install --no-deps git+https://github.com/hynek/argon2-cffi.git
-      - run: python -Im argon2 -n 1 -t 1 -m 8 -p 1
-
   install-dev:
     name: Verify dev env
     runs-on: ${{ matrix.os }}
@@ -144,9 +165,10 @@ jobs:
     if: always()
 
     needs:
+      - build-package
       - tests
+      - tests-pypy
       - install-dev
-      - package
       - system-package
       - cog-check