ci: Add CI via GitHub Actions

.github/workflows/ci.yml

@@ -0,0 +1,21 @@
+name: CI
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Setup Environment
+      run: echo "::add-path::$HOME/.local/bin"
+    - name: Install dependencies
+      run: |
+        sudo apt install -y python3-setuptools ninja-build
+        pip3 install meson
+    - name: Configure
+      run: mkdir build; meson -Dbuildtype=debugoptimized build
+    - name: Build
+      run: ninja -v -C build
+    - name: Test
+      run: meson test -v -C build