install geth for ubuntu and macos

Author: activecoder10

.github/workflows/test.yml

@@ -39,6 +39,20 @@ jobs:
         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: Format
         run: make format