refactor: set deploy-source and metadata at deploy time

This ensures the value is correct, where previously it was computed based on a file - and therefore did not distinguish between git:from-archive and git:from-image.

Closes #4464

plugins/apps/apps.go

@@ -0,0 +1,15 @@
+package apps
+
+var (
+	// DefaultProperties is a map of all valid network properties with corresponding default property values
+	DefaultProperties = map[string]string{
+		"deploy-source":          "",
+		"deploy-source-metadata": "",
+	}
+
+	// GlobalProperties is a map of all valid global network properties
+	GlobalProperties = map[string]bool{
+		"deploy-source":          true,
+		"deploy-source-metadata": true,
+	}
+)