ci: add basic CI workflow

Author: vitallium

.github/workflows/ci.yml

@@ -0,0 +1,40 @@
+---
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+
+    defaults:
+      run:
+        shell: bash
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Rust
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          profile: minimal
+          override: true
+
+      - name: Run tests
+        run: cargo test
+
+      - name: Check for snapshot changes
+        run: |
+          if git status --porcelain tests/languages | grep -q "snapshots/"; then
+            echo "Error: Snapshot files have changed. Run 'cargo insta review' locally and commit the changes."
+            git diff -- tests/languages/*/snapshots
+            exit 1
+          fi