Move CI to github.

Why not, it's free.

.github/workflows/build.yaml

@@ -0,0 +1,50 @@
+name: Build
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - 'v*'
+  pull_request:
+
+jobs:
+  Build:
+    name: Build
+    runs-on: ubuntu-latest
+    env:
+      QT_VERSION: 6.7.3
+      QMAKE: ${{ github.workspace }}/${{ env.QT_VERSION }}/gcc_64/bin/qmake
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Install apt packages
+        run: |
+          sudo apt update -y
+          sudo apt install -y \
+            build-essential \
+            cmake \
+            curl \
+            libgl1-mesa-dev \
+            python3 \
+            python3-pip
+
+      - name: Install aqtinstall
+        run: |
+          python3 -m pip install aqtinstall
+
+      - name: Install Qt
+        run: |
+          aqt install-qt linux desktop $QT_VERSION linux_gcc_64
+
+      - name: Build clide
+        run: |
+          cargo b --release
+
+      - name: Test libclide
+        run: |
+          cargo test -p libclide
+
+      - name: Test clide
+        run: |
+          cargo test