ci: add CI workflow for push/PR on main

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: intel352

.github/workflows/ci.yml

@@ -0,0 +1,20 @@
+name: CI
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+env:
+  GOPRIVATE: github.com/GoCodeAlone/*
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.26'
+      - name: Configure Git for private repos
+        run: git config --global url."https://x-access-token:${{ secrets.RELEASES_TOKEN }}@github.com/".insteadOf "https://github.com/"
+      - run: go test -race ./...
+      - run: go vet ./...