Ignore erronious dirty tracking

.gitmodules

@@ -1,15 +1,20 @@
 [submodule "ext/ImageSharp"]
 	path = ext/ImageSharp
 	url = https://github.com/SixLabors/ImageSharp.git
+	ignore = dirty
 [submodule "ext/ImageSharp.Web"]
 	path = ext/ImageSharp.Web
 	url = https://github.com/SixLabors/ImageSharp.Web.git
+	ignore = dirty
 [submodule "ext/Fonts"]
 	path = ext/Fonts
 	url = https://github.com/SixLabors/Fonts.git
+	ignore = dirty
 [submodule "ext/Shapes"]
 	path = ext/Shapes
 	url = https://github.com/SixLabors/Shapes.git
+	ignore = dirty
 [submodule "ext/Core"]
 	path = ext/Core
 	url = https://github.com/SixLabors/Core.git
+	ignore = dirty