ci: don't put release-artifact in tree

.gitignore

@@ -18,3 +18,4 @@ kernel/gecko/*.h
 kernel/bin2h/bin2h
 loader/*.lnk
 loader/wiiload.exe
+release-artifact/*

release-artifact/apps/nintendont-slippi-forwarder/meta.xml

@@ -1,15 +0,0 @@
-<?xml version="1.0" encoding="ISO-8859-1" standalone="yes"?>
-<app version="1">
-	<name>Forwarder for Nintendont-Slippi</name>
-	<coder>FIX94</coder>
-	<version>1.0</version>
-	<release_date>20190222000000</release_date>
-	<short_description>Nintendont Forwarder</short_description>
-	<long_description> Commiters: Fizzi 
-
-Project website: https://github.com/project-slippi/Nintendont 
- 
-Allows you to forward to Nintendont-Slippi from priiloader so that you don't need to reconfigure it if you update Nintendont</long_description>
-	<no_ios_reload/>
-	<ahb_access/>
-</app>

release-artifact/apps/slippi-wiiconf/meta.xml

@@ -1,9 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<app version="1.0">
-	<name>slippi-wiiconf</name>
-	<coder>https://github.com/project-slippi</coder>
-	<version>0.1</version>
-	<release_date>20190304000000</release_date>
-	<short_description>Project Slippi configuration</short_description>
-	<long_description>Utility to help configure a Wii, for use with Project Slippi.</long_description>
-</app>