Github CI build php 5.6

.github/workflows/main-ci.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php_version: ["7.0", "7.1", "7.2", "7.3", "7.4", "8.0"]
+        php_version: ["5.6", "7.0", "7.1", "7.2", "7.3", "7.4", "8.0"]
         service: [php-fpm, php-worker, workspace, laravel-horizon]
     steps:
     - uses: actions/checkout@v2