Add support for Additional fragment to the builder

docker-compose-generator/.editorconfig

@@ -0,0 +1,2 @@
+[*.cs]
+indent_style = tab

docker-compose-generator/src/DockerComposition.cs

@@ -21,6 +21,11 @@ namespace DockerGenerator
 			get;
 			set;
 		}
+		public string[] AdditionalFragments
+		{
+			get;
+			set;
+		}
 
 		public static DockerComposition FromEnvironmentVariables()
 		{
@@ -35,6 +40,7 @@ namespace DockerGenerator
 			}
 			composition.SelectedProxy = (Environment.GetEnvironmentVariable("BTCPAYGEN_REVERSEPROXY") ?? "").ToLowerInvariant();
 			composition.SelectedLN = (Environment.GetEnvironmentVariable("BTCPAYGEN_LIGHTNING") ?? "").ToLowerInvariant();
+			composition.AdditionalFragments = (Environment.GetEnvironmentVariable("BTCPAYGEN_ADDITIONAL_FRAGMENTS") ?? "").ToLowerInvariant().Split(';');
 			return composition;
 		}
 	}

docker-compose-generator/src/Program.cs

@@ -92,6 +92,11 @@ namespace DockerGenerator
                 }
             }
 
+            foreach(var fragment in composition.AdditionalFragments)
+            {
+                fragments.Add(fragment.Trim());
+            }
+
 			var def = new DockerComposeDefinition(name, fragments);
 			def.FragmentLocation = fragmentLocation;
 			def.BuildOutputDirectory = output;