Creating build action for all pushes

This will run mypy, flake8, and pytest

.github/workflows/test_push.yml

@@ -0,0 +1,33 @@
+name: Type check, lint, and test
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.8
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.8
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip setuptools wheel
+        pip install -r requirements.txt
+    - name: Type check with mypy
+      run: |
+        mypy ./topologic
+        mypy ./tests
+    - name: Lint with flake8
+      run: |
+        pip install flake8
+        # stop the build if there are Python syntax errors or undefined names
+        flake8 ./topologic ./tests --count --select=E9,F63,F7,F82 --show-source --statistics
+        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+        flake8 ./topologic ./tests --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+    - name: Test with pytest
+      run: |
+        pytest tests topologic --doctest-modules