Add github action support.

.github/workflows/test.yml

@@ -0,0 +1,36 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    paths-ignore:
+    - '**.md'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Add emacs PPA
+      run: sudo add-apt-repository -y ppa:kelleyk/emacs
+    - name: Install Emacs
+      run: sudo apt-get update && sudo apt-get install -y xvfb emacs26
+    - uses: actions/setup-python@v1.1.1
+      with:
+        python-version: '3.6'
+        architecture: 'x64'
+    - name: Install Cask
+      uses: conao3/setup-cask@master
+      with:
+        version: 'snapshot'
+    - name: Checkout sources
+      uses: actions/checkout@v2
+    - name: Install package dependencies
+      run: |
+        cask install
+    - name: Run tests
+      run: |
+        xvfb-run --auto-servernum cask exec ert-runner --win
+      env:
+        CI: true
+    - name: Cleanup xvfb pidx
+      uses: bcomnes/cleanup-xvfb@v1