Add github actions CI workflow

.github/workflows/ci.yml

@@ -0,0 +1,37 @@
+on:
+  # Trigger the workflow on push or
+  # pull request, but only for the
+  # master branch.
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+  # Weekly run to account for
+  # changed dependencies.
+  schedule:
+    - cron: '17 04 * * 0'
+
+name: CI
+jobs:
+  build:
+    name: Build and test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        compiler: ['gcc', 'clang']
+      fail-fast: false
+    env:
+      CC: ${{ matrix.compiler }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Build the code
+        run: make
+
+      - name: Test creating the release archive
+        run: make distcheck