Add simple CI

Author: Kobzol

.github/workflows/test.yml

@@ -0,0 +1,16 @@
+name: CI
+on:
+  pull_request:
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: rustup toolchain install stable --profile minimal
+      - uses: Swatinem/rust-cache@v2
+      - name: Build
+        run: cargo build --all-targets
+      - name: Check formatting
+        run: cargo fmt --all --check