Set up CI pipeline with github actions.

Author: tbenthompson

.github/workflows/workflow.yml

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+name: Lint and Test
+
+on: [push]
+
+jobs:
+  build-linux:
+    runs-on: ubuntu-latest
+    strategy:
+      max-parallel: 5
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.8
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.8
+    - name: Add conda to system path
+      run: |
+        # $CONDA is an environment variable pointing to the root of the miniconda directory
+        echo $CONDA/bin >> $GITHUB_PATH
+    - name: Install dependencies
+      run: |
+        conda env update --file environment.yml --name base
+    - name: Lint with flake8
+      run: |
+        flake8 . 
+    - name: Check formatting with black
+      run: |
+        black . 
+    - name: Test with pytest
+      run: |
+        py.test
+

environment.yml

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+name: cppimport
+channels:
+  - conda-forge
+dependencies:
+  - pybind11
+  - mako
+  - black
+  - pytest
+  - flake8