tests: mock get_config for core testing

Author: guillaumeboehm

tests/unit/core_spec.lua

@@ -21,6 +21,11 @@ local function mock_api_client()
     get_current_project = function()
       return Promise.new():resolve({ id = 'test-project-id' })
     end,
+    get_config = function()
+      return Promise.new():resolve({ agent = {
+          build = { disable = false, mode = 'primary' }
+      }})
+    end,
   }
 end