ci: More wheel hell

.github/workflows/buildwheels.yml

@@ -9,7 +9,8 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-20.04, macos-12, macos-14]
+        # macos-13 is an intel runner, macos-14 is apple silicon
+        os: [ubuntu-latest, macos-13, macos-14]
     steps:
       - uses: actions/checkout@v4
 
@@ -24,7 +25,13 @@ jobs:
         with:
           platforms: all
 
+      - name: Set MACOSX_DEPLOYMENT_TARGET dynamically from the runner
+        if: runner.os == 'macOS'
+        run: echo "MACOSX_DEPLOYMENT_TARGET=$(sw_vers -productVersion | cut -d. -f1,2)" >> $GITHUB_ENV
+
       - name: Build wheels
+        env:
+          CIBW_ENVIRONMENT: MACOSX_DEPLOYMENT_TARGET=${{ env.MACOSX_DEPLOYMENT_TARGET }}
         uses: pypa/[email protected]
 
       - uses: actions/upload-artifact@v3

.github/workflows/publish.yml

@@ -2,6 +2,8 @@ name: Build and upload to PyPI
 
 on:
   workflow_dispatch:
+  release:
+    types: [published] 
 
 jobs:
   build_wheels:
@@ -26,6 +28,8 @@ jobs:
           platforms: all
 
       - name: Build wheels
+        env:
+          CIBW_ENVIRONMENT: MACOSX_DEPLOYMENT_TARGET=11
         uses: pypa/[email protected]
 
       - uses: actions/upload-artifact@v3

pyproject.toml

@@ -78,5 +78,6 @@ before-all = "yum install -y gcc make zlib-devel openssl-devel libpng-devel"
 [tool.cibuildwheel.macos]
 archs = ["auto"]  # "arm64" needs M1 runner on GitHub Actions
 before-all = """
+export MACOSX_DEPLOYMENT_TARGET=${sw_vers -productVersion | cut -d. -f1}
 brew install pkg-config openssl libpng  # -> /usr/local (x86_64)
 """