Auto-load appsettings.*.json files at startup

Dynamically adds all appsettings.*.json files in the root directory to the configuration, excluding appsettings.Development.json and appsettings.migration.json. This streamlines configuration management by automatically including relevant environment or custom config files.

src/ReC.API/Program.cs

@@ -25,6 +25,13 @@ try
 
     var config = builder.Configuration;
 
+    Directory
+        .GetFiles(builder.Environment.ContentRootPath, "appsettings.*.json", SearchOption.TopDirectoryOnly)
+        .Where(file => Path.GetFileName(file) != $"appsettings.Development.json")
+        .Where(file => Path.GetFileName(file) != $"appsettings.migration.json")
+        .ToList()
+        .ForEach(file => config.AddJsonFile(file, true, true));
+
     // Add services to the container.
     builder.Services.AddRecServices(options =>
     {