Add option to add debug keystore in Android export

platform/android/export/export.cpp

@@ -1157,6 +1157,9 @@ public:
 			r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, launcher_icons[i].option_id, PROPERTY_HINT_FILE, "*.png"), ""));
 		}
 
+		r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, "keystore/debug", PROPERTY_HINT_GLOBAL_FILE, "*.keystore"), ""));
+		r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, "keystore/debug_user"), ""));
+		r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, "keystore/debug_password"), ""));
 		r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, "keystore/release", PROPERTY_HINT_GLOBAL_FILE, "*.keystore"), ""));
 		r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, "keystore/release_user"), ""));
 		r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, "keystore/release_password"), ""));
@@ -1417,12 +1420,15 @@ public:
 			err += "OpenJDK 8 jarsigner not configured in the Editor Settings.\n";
 		}
 
-		String dk = EditorSettings::get_singleton()->get("export/android/debug_keystore");
+		String dk = p_preset->get("keystore/debug");
 
 		if (!FileAccess::exists(dk)) {
 
-			valid = false;
-			err += "Debug keystore not configured in the Editor Settings.\n";
+			dk = EditorSettings::get_singleton()->get("export/android/debug_keystore");
+			if (!FileAccess::exists(dk)) {
+				valid = false;
+				err += "Debug keystore not configured in the Editor Settings nor in the preset.\n";
+			}
 		}
 
 		bool apk_expansion = p_preset->get("apk_expansion/enable");
@@ -1772,9 +1778,17 @@ public:
 			String password;
 			String user;
 			if (p_debug) {
-				keystore = EditorSettings::get_singleton()->get("export/android/debug_keystore");
-				password = EditorSettings::get_singleton()->get("export/android/debug_keystore_pass");
-				user = EditorSettings::get_singleton()->get("export/android/debug_keystore_user");
+
+				keystore = p_preset->get("keystore/debug");
+				password = p_preset->get("keystore/debug_password");
+				user = p_preset->get("keystore/debug_user");
+
+				if (keystore.empty()) {
+
+					keystore = EditorSettings::get_singleton()->get("export/android/debug_keystore");
+					password = EditorSettings::get_singleton()->get("export/android/debug_keystore_pass");
+					user = EditorSettings::get_singleton()->get("export/android/debug_keystore_user");
+				}
 
 				ep.step("Signing debug APK...", 103);