Added basic CI workflow (#13)

.github/workflows/test.yml

@@ -0,0 +1,65 @@
+name: Test
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+    types:
+      - opened
+      - synchronize
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  ci:
+    name: CI on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - ubuntu-24.04
+          - macos-14
+
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      - name: Setup Rust toolchain
+        uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          rustflags: ""
+
+      # ────────────── Install geth ──────────────
+      - name: Install Geth on Ubuntu
+        if: matrix.os == 'ubuntu-24.04'
+        run: |
+          sudo add-apt-repository -y ppa:ethereum/ethereum
+          sudo apt-get update
+          sudo apt-get install -y ethereum
+
+      - name: Install Geth on macOS
+        if: matrix.os == 'macos-14'
+        run: |
+          brew tap ethereum/ethereum
+          brew install ethereum
+
+      - name: Machete
+        uses: bnjbvr/cargo-machete@v0.7.1
+
+      - name: Format
+        run: make format
+
+      - name: Clippy
+        run: make clippy
+
+      - name: Test cargo workspace
+        run: make test