CI: add Github Actions

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+- package-ecosystem: "github-actions"
+  directory: "/"
+  schedule:
+    interval: "daily"

.github/workflows/build.yaml

@@ -0,0 +1,24 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+
+env:
+  VERBOSE: 1
+
+jobs:
+  build-test:
+    name: Test on Ubuntu 22.04
+    runs-on: ubuntu-22.04
+    steps:
+    - uses: actions/checkout@v4
+    - name: Install Linux dependencies
+      run: |
+        sudo apt-get -q update
+        sudo apt-get -q -y install check gettext libglib2.0-dev libgtk-3-dev libjson-glib-dev libpango1.0-dev meson ninja-build pkgconf xauth xvfb
+    - name: Build and test
+      uses: BSFishy/[email protected]
+      with:
+        action: test
+        options: --verbose