.github: Create a GitHub Action

Author: simnalamburt

.github/workflows/ci.yml

@@ -0,0 +1,13 @@
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo build
+      - run: cargo test
+      - run: cargo clippy --no-deps -- -D warnings
+      - run: cargo fmt -- --check