Add GitHub workflow for building and testing

.github/workflows/test.yaml

@@ -0,0 +1,20 @@
+name: Test
+on:
+  push:
+    branches: ["master"]
+    pull_request:
+      types:
+        - opened
+        - edited
+  workflow_dispatch:
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: sudo sed -i 's/jammy/lunar/g' /etc/apt/sources.list
+      - run: sudo apt update
+      - run: sudo apt dist-upgrade
+      - run: sudo apt install -y appstream-util libadwaita-1-dev libepoxy-dev libgtk-4-dev libmpv-dev meson ninja-build pkg-config gettext
+      - run: meson setup build
+      - run: ninja -C build test