ci: Add CI

.github/CODEOWNERS

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+/.github/workflows/ @oleavr

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  meson:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repo
+        uses: actions/checkout@v4
+      - name: Install dependencies
+        run: |
+          sudo apt-get install \
+              gobject-introspection \
+              libgirepository1.0-dev \
+              libglib2.0-dev \
+              meson \
+              ninja-build \
+              valac
+      - name: Build
+        run: |
+          meson setup build
+          meson compile -C build
+      - name: Test
+        run: meson test -C build
+
+  autotools:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repo
+        uses: actions/checkout@v4
+      - name: Install dependencies
+        run: |
+          sudo apt-get install \
+              autoconf-archive \
+              gobject-introspection \
+              libgirepository1.0-dev \
+              libglib2.0-dev \
+              valac
+      - name: Build
+        run: |
+          ./autogen.sh
+          make -j$(nproc)
+      - name: Test
+        run: make check