test building of universal2 wheels

Author: jswhit

.github/workflows/build-wheels.yml

@@ -24,19 +24,20 @@ jobs:
 
       fail-fast: false
       matrix:
-        python-version: [ "3.6", "3.7", "3.8", "3.9", "3.10" ]
+        #python-version: [ "3.6", "3.7", "3.8", "3.9", "3.10" ]
+        python-version: [ "3.8", "3.9", "3.10" ]
         os: [ubuntu-latest, macos-latest]
         platform: [x64, x32]
         exclude:
           - os: macos-latest  
             platform: x32
         include:
-          - python-version: "3.6"
-            os: ubuntu-latest
-            platform: aarch64
-          - python-version: "3.7"
-            os: ubuntu-latest
-            platform: aarch64
+#         - python-version: "3.6"
+#           os: ubuntu-latest
+#           platform: aarch64
+#         - python-version: "3.7"
+#           os: ubuntu-latest
+#           platform: aarch64
           - python-version: "3.8"
             os: ubuntu-latest
             platform: aarch64
@@ -46,14 +47,15 @@ jobs:
           - python-version: "3.10"
             os: ubuntu-latest
             platform: aarch64
+# cross-compiled wheels for osx-arm64 don't work because of C libs, turn off for now
           - python-version: "3.8"
-            os: macos-10.15
+            os: macos-latest  
             platform: x86_64
           - python-version: "3.9"
-            os: macos-10.15
+            os: macos-latest  
             platform: x86_64
           - python-version: "3.10"
-            os: macos-10.15
+            os: macos-latest   
             platform: x86_64
     env:
       REPO_DIR: netcdf4-python
@@ -89,8 +91,8 @@ jobs:
         if [ "macos-latest" == "${{ matrix.os }}" ]; then echo "TRAVIS_OS_NAME=osx" >> $GITHUB_ENV; else echo "TRAVIS_OS_NAME=${{ matrix.os }}" >> $GITHUB_ENV; fi
         if [ "schedule" == "${{ github.event_name }}" ]; then echo "TRAVIS_EVENT_TYPE=cron" >> $GITHUB_ENV; else echo "TRAVIS_EVENT_TYPE=${{ github.event_name }}" >> $GITHUB_ENV; fi
         if [ "schedule" == "${{ github.event_name }}" ]; then echo "BUILD_COMMIT=master" >> $GITHUB_ENV; else echo "BUILD_COMMIT=$BUILD_COMMIT" >> $GITHUB_ENV; fi
-        # make universal2 wheels on macos 10.15 by cross-compiling
-        if [ "macos-10.15" == "${{ matrix.os }}" ]; then echo "PLAT=universal2" >> $GITHUB_ENV; fi
+        # make universal2 wheels on macos by cross-compiling 
+        if [ "macos-latest" == "${{ matrix.os }}" ]; then echo "PLAT=universal2" >> $GITHUB_ENV; fi
 
     - name: Setup Special Environment variables for Linux AArch64
       if: ${{ matrix.platform == 'aarch64' }}