chore: variable casing

Author: Warren-Pitterson

src/ServiceLayer.API/Program.cs

@@ -9,7 +9,7 @@
     ?? throw new InvalidOperationException($"Environment variable 'EVENT_GRID_TOPIC_URL' is not set or is empty.");
 var eventGridTopicKey = Environment.GetEnvironmentVariable("EVENT_GRID_TOPIC_KEY")
     ?? throw new InvalidOperationException($"Environment variable 'EVENT_GRID_TOPIC_KEY' is not set or is empty.");
-var DatabaseConnectionString = Environment.GetEnvironmentVariable("DatabaseConnectionString")
+var databaseConnectionString = Environment.GetEnvironmentVariable("DatabaseConnectionString")
     ?? throw new InvalidOperationException($"Environment variable 'DatabaseConnectionString' is not set or is empty.");
 
 
@@ -30,7 +30,7 @@
         });
         services.AddDbContext<ServiceLayerDbContext>(options =>
         {
-            options.UseSqlServer(DatabaseConnectionString);
+            options.UseSqlServer(databaseConnectionString);
         });
     })
     .Build();