cicd: introduce CI

.github/workflows/ci.yaml

@@ -0,0 +1,39 @@
+name: CI
+
+on:
+  push:
+    branches: ["master"]
+  pull_request:
+    branches: ["master"]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  format:
+    name: rustfmt
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: nightly
+      - uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: -- --check
+
+  test:
+    name: cargo test
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+      - uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --all-targets --all-features