Test GitHub actions

Author: bdash

.github/workflows/test.yml

@@ -0,0 +1,25 @@
+name: CI
+
+on: [push, workflow_dispatch]
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - ubuntu-24.04
+          - macos-15
+    steps:
+      - uses: actions/checkout@v4
+      - uses: jurplel/install-qt-action@v4
+        name: Install Qt
+        with:
+          version: '6.8.2'
+          cache: true
+      - name: Build
+        run: |
+          cmake -S view/sharedcache -B build -G Ninja
+          cmake --build build
+