Skip go builds for smart contract changes

.github/workflows/build.yml

@@ -1,22 +1,24 @@
-name: Build Quasar
+name: Build Quasar (Go)
 
 on:
   pull_request:
     branches:
       - main
       - fix/*
+    paths-ignore:
+      - 'smart-contracts/**'
   push:
     branches:
       - main
       - fix/*
+    paths-ignore:
+      - 'smart-contracts/**'
   workflow_dispatch:
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref }}
   cancel-in-progress: true
 
-# This workflow makes x86_64 binaries for linux.
-# TODO: add darwin later
 jobs:
   build-go:
     name: quasar-${{ matrix.targetos }}-${{ matrix.arch }}