Configure DbContext for migrations

Added configuration for DbContext to handle migrations and set a default connection string.

Author: berviantoleo

BervProject.WebApi.Boilerplate/EntityFramework/BoilerplateDbContext.cs

@@ -34,6 +34,22 @@ public BoilerplateDbContext(DbContextOptions options) : base(options)
 
         }
 
+        /// <summary>
+        /// Configure DbContext for migrations
+        /// </summary>
+        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+        {
+            if (!optionsBuilder.IsConfigured)
+            {
+                var connectionString = Environment.GetEnvironmentVariable("ConnectionStrings__BoilerplateConnectionString");
+                if (string.IsNullOrEmpty(connectionString))
+                {
+                    connectionString = "Host=localhost;Database=testdb;Username=postgres;Password=postgres";
+                }
+                optionsBuilder.UseNpgsql(connectionString);
+            }
+        }
+
         /// <summary>
         /// Adding relationship
         /// </summary>