feat: switch to Github Actions (#41)

Switch to Github Actions, as it's an integrated experience within Github,
and also seems to be faster than Azure Pipelines for our (simple) workload.

.github/workflows/main.yml

@@ -0,0 +1,70 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  schedule:
+    - cron: "0 1 * * *"
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [2.7, 3.5, 3.6, 3.7, 3.8]
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install flake8 pytest pytest-cov
+# TODO: there are several flake8 errors right now. Once they are cleaned up we should uncomment this stanza.
+#    - name: Lint with flake8
+#      run: |
+#        # stop the build if there are Python syntax errors or undefined names
+#        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+#        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+#        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+    - name: Test with pytest
+      run: |
+        pytest tests --doctest-modules --junitxml=junit/test-results-${{ matrix.python-version }}.xml --cov=callgraph --cov-report=xml --cov-report=html
+    - name: Upload pytest test results
+      uses: actions/upload-artifact@v2
+      with:
+        name: pytest-results-${{ matrix.python-version }}.xml
+        path: junit/test-results-${{ matrix.python-version }}.xml
+      # Use always() to always run this step to publish test results when there are test failures
+      if: ${{ always() }}
+  generate-samples:
+    runs-on: ubuntu-latest
+    needs: test
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.8
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.8
+    - name: Install dependencies
+      run: |
+        sudo apt-get install graphviz
+    - name: Generate sample images
+      run: |
+        bash scripts/generate-examples.sh
+  build:
+    runs-on: ubuntu-latest
+    needs: test
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.8
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.8
+    - name: Build sdist
+      run: |
+        python setup.py sdist

README.md

@@ -1,6 +1,5 @@
 # cmd-call-graph
 
-[![Build Status](https://dev.azure.com/cmd-call-graph/cmd-call-graph/_apis/build/status/Microsoft.cmd-call-graph?branchName=master)](https://dev.azure.com/cmd-call-graph/cmd-call-graph/_build/latest?definitionId=1?branchName=master)
 [![PyPI](https://img.shields.io/pypi/v/cmd-call-graph.svg)](https://pypi.org/project/cmd-call-graph/)
 
 A simple tool to generate a call graph for calls within Windows CMD (batch) files.