feat: image url migration

registrations can now store image urls, which will be shown at view.html

WebApp/Migrations/20250602005444_EventImageURL.cs

@@ -0,0 +1,28 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace WebApp.Migrations
+{
+    /// <inheritdoc />
+    public partial class EventImageURL : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<string>(
+                name: "ImageURL",
+                table: "Events",
+                type: "text",
+                nullable: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "ImageURL",
+                table: "Events");
+        }
+    }
+}