Github action: nightly builds with mxnet

.github/workflows/mxnet_nightly.yml

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+# Runs unit & system tests with mxnet nightly builds (both mxnet and mxnet-mkl)
+name: MXNet Nightly
+
+on:
+  schedule:
+    # * is a special character in YAML so you have to quote this string
+    # nightly:
+    - cron:  '0 0 * * *'
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+
+    strategy:
+      max-parallel: 4
+      fail-fast: false
+      matrix:
+        python-version: [3.6, 3.7]
+        platform: [ubuntu-latest, windows-latest]
+        mxnet-version: [mxnet-mkl, mxnet]
+
+    # The type of runner that the job will run on
+    runs-on: ${{ matrix.platform }}
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+    # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+    - uses: actions/checkout@v2
+      with:
+        ref: sockeye_2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python-version }}
+    # Runs a set of commands using the runners shell:
+    - name: Install dependencies ${{ matrix.mxnet-version }}
+      run: |
+        python -m pip install --upgrade pip
+        pip install --pre ${{ matrix.mxnet-version }}
+        pip install -r requirements/requirements.txt
+        pip install -r requirements/requirements.dev.txt
+    # Runs a single command using the runners shell
+    - name: Unit tests
+      run: python3 setup.py test
+    - name: System tests
+      run: python -m pytest --maxfail=1 test/system