Keep the commit check green while Python 3.15 can't install

continue-on-error on the 3.15 jobs kept the run passing, but each job
still counted as a failed check, so the commit showed a red X. The 3.15
steps are now allowed to fail instead, which leaves the job green with
the failure in its log, and the steps after the install skip until it
works. The jobs are named "(allowed to fail)".

Signed-off-by: Jacob Stopak <jacob@initialcommit.io>

Author: initialcommit-io

.github/workflows/tests.yml

@@ -10,16 +10,17 @@ permissions:
 
 jobs:
   unit:
-    name: ${{ matrix.os }}, Python ${{ matrix.python }}
+    name: ${{ matrix.os }}, Python ${{ matrix.python }}${{ matrix.python == '3.15' && ' (allowed to fail)' || '' }}
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         python: ["3.10", "3.11", "3.12", "3.13", "3.14", "3.15"]
-    # skia-python publishes no 3.15 wheels yet, so 3.15 runs report
-    # whether the install works there without failing the others
-    continue-on-error: ${{ matrix.python == '3.15' }}
+    # skia-python publishes no 3.15 wheels yet, so on 3.15 each step may fail:
+    # its log says how far it got, but the job (and the commit's check) stays
+    # green. continue-on-error on the job itself would still mark the commit
+    # failed. The steps after the install run once it succeeds.
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
@@ -30,15 +31,22 @@ jobs:
         if: runner.os == 'Linux'
         run: sudo apt-get update && sudo apt-get install -y libegl1 libgl1 libfontconfig1
       - name: Install
+        id: install
+        continue-on-error: ${{ matrix.python == '3.15' }}
         run: python -m pip install ".[dev]"
       - name: Set a Git identity for the test repos
+        if: steps.install.outcome == 'success'
         run: |
           git config --global user.name "git-sim tests"
           git config --global user.email "tests@example.com"
           git config --global init.defaultBranch main
       - name: Unit tests
+        if: steps.install.outcome == 'success'
+        continue-on-error: ${{ matrix.python == '3.15' }}
         run: python -m pytest tests/unit_tests -q
       - name: Draw a simulation
+        if: steps.install.outcome == 'success'
+        continue-on-error: ${{ matrix.python == '3.15' }}
         shell: bash
         run: |
           git init -q demo && cd demo