add github actions workflow

Author: jswhit

.github/workflows/build-wheels.yml

@@ -0,0 +1,108 @@
+# This workflow will install Python dependencies, run tests and lint with a variety of Python versions
+# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
+
+name: Build and upload wheels
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+  create:
+    tags:
+#  schedule:
+#    - cron: '0 0 * * 0,3' # 2/weekly
+
+jobs:
+  build:
+
+    runs-on: ${{ matrix.os }}
+    defaults:
+      run:
+        shell: bash
+    strategy:
+
+      fail-fast: false
+      matrix:
+#       python-version: ["3.6", "3.7", "3.8", "3.9"]
+#       os: [ubuntu-latest, macos-latest]
+#       platform: [x64, x32]
+# test on a single platform, python version
+        python-version: ["3.8"]
+        os: [ubuntu-latest]
+        platform: [x64]
+        MB_ML_VER: [2014]
+        exclude:
+          - os: macos-latest  
+            platform: x32
+    env:
+      REPO_DIR: netcdf4-python
+      PKG_NAME: netcdf4-python
+      BUILD_COMMIT: src_reorg
+      UNICODE_WIDTH: 32
+      MB_PYTHON_VERSION: ${{ matrix.python-version }}
+      TRAVIS_PYTHON_VERSION: ${{ matrix.python-version }}
+      MB_ML_VER: ${{ matrix.MB_ML_VER }}
+      TRAVIS_REPO_SLUG: ${{ github.repository }}
+      TRAVIS_BRANCH: ${{ github.head_ref }}
+      TRAVIS_PULL_REQUEST: ${{ github.event.number }}
+      TRAVIS_BUILD_DIR: ${{ github.workspace }}
+      MULTIBUILD_WHEELS_STAGING_ACCESS: ${{ secrets.MULTIBUILD_WHEELS_STAGING_ACCESS }}
+
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        submodules: recursive
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Setup Environment variables
+      run: |
+        if [ "schedule" == "${{ github.event_name }}" ] || [ "master" == "$BUILD_COMMIT" ]; then echo "TOKEN=$SCIPY_WHEELS_NIGHTLY_ACCESS" >> $GITHUB_ENV; else echo "TOKEN=$MULTIBUILD_WHEELS_STAGING_ACCESS" >> $GITHUB_ENV; fi
+        if [ "x32" == "${{ matrix.platform }}" ]; then echo "PLAT=i686" >> $GITHUB_ENV; else echo "PLAT=x86_64" >> $GITHUB_ENV; fi
+        if [ "macos-latest" == "${{ 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" >> $GITHUB_ENV; fi
+    - name: Setup Special Environment variables for Linux
+      if: startsWith(matrix.os,'ubuntu') && matrix.MB_ML_VER == 2010
+      run: |
+        echo "DOCKER_TEST_IMAGE=$(echo multibuild/xenial_$PLAT)" >> $GITHUB_ENV
+    - name: Print some Environment variable
+      run: |
+        echo "TRAVIS_BRANCH: ${TRAVIS_BRANCH}"
+        echo "TRAVIS_PULL_REQUEST: ${TRAVIS_PULL_REQUEST}"
+        echo "TRAVIS_REPO_SLUG: ${TRAVIS_REPO_SLUG}"
+        echo "TRAVIS_EVENT_TYPE: ${TRAVIS_EVENT_TYPE}"
+        echo "TRAVIS_OS_NAME: ${TRAVIS_OS_NAME}"
+        echo "PLAT: ${PLAT}"
+        echo "DOCKER_TEST_IMAGE: ${DOCKER_TEST_IMAGE}"
+
+    - name: Install VirtualEnv
+      run: |
+        python -m pip install --upgrade pip
+        pip install virtualenv
+    - name: Build and Install Wheels
+      run: |
+        source multibuild/common_utils.sh
+        source multibuild/travis_steps.sh
+        echo "------- BEFORE INSTALL --------"
+        before_install
+        echo "------- CLEAN CODE --------"
+        clean_code $REPO_DIR $BUILD_COMMIT
+        echo "------- BUILD WHEEL --------"
+        build_wheel $REPO_DIR $PLAT
+        echo "------- INSTALL_RUN --------"
+        install_run $PLAT
+        cd $TRAVIS_BUILD_DIR
+        pwd
+        find ./ -name "*.whl" -print
+    - name: Upload wheels to release
+      uses: svenstaro/upload-release-action@v2
+      if: github.event_name == 'create'
+      with:
+        repo_token: ${{ secrets.GITHUB_TOKEN }}
+        file: ${{ github.workspace }}/wheelhouse/netCDF4*whl
+        tag: ${{ github.ref }}
+        overwrite: true
+        file_glob: true