ci: single quotes main

Author: coolapso

.github/workflows/test.yaml

@@ -23,7 +23,7 @@ jobs:
       - name: 'get base branch last commit'
         run: git fetch origin main:main --depth 1
         shell: bash
-        if: ${{ github.ref_name != "main" }}
+        if: ${{ github.ref_name != 'main' }}
 
       - name: Setup Go
         uses: actions/setup-go@v5