update luacheck worlkflow and add badge

.luacheckrc

@@ -1,22 +1,12 @@
-unused_args = false
-allow_defined_top = true
 
 globals = {
 	"spacesuit",
 }
 
 read_globals = {
-	-- Stdlib
-	string = {fields = {"split"}},
-	table = {fields = {"copy", "getn"}},
-	"call",
-
 	-- Minetest
 	"minetest",
-	"vector", "ItemStack",
-	"dump", "VoxelArea",
 
 	-- Deps
-	"unified_inventory", "default", "monitoring",
-	"armor"
+	"armor",
 }