TO BE REWORKED BEFORE MERGE: temporary macOS CI test config

This is an interim hack to remove things from CI config unrelated to
beating the test suite into shape on macOS, for a bit faster turnaround.
To be cleaned up and properly integrated to check.yaml before merge.

.github/workflows/ci.yaml

@@ -4,10 +4,11 @@ on:
   pull_request:
   push:
     branches:
-      - master
+      - macos-ci
 
 jobs:
   pre-commit:
+    if: false
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -38,6 +39,7 @@ jobs:
           pre-commit run --color=always --all-files --show-diff-on-failure
 
   distcheck:
+    if: false
     runs-on: ubuntu-latest
     strategy:
       matrix:
@@ -96,3 +98,9 @@ jobs:
         env:
           GH_TOKEN: ${{github.token}}
         if: steps.release.outputs.release_created
+
+  distcheck-macos:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: env PYTESTFLAGS=--verbose test/macos-script.sh