Add luacheck config and ci job

.gitlab-ci.yml

@@ -0,0 +1,8 @@
+stages:
+  - test
+
+luacheck:
+ stage: test
+ image: pipelinecomponents/luacheck:latest
+ script:
+  - luacheck .

.luacheckrc

@@ -0,0 +1,24 @@
+unused_args = false
+max_line_length= 240
+redefined = false
+
+globals = {
+	"pipeworks",
+	"luaentity"
+}
+
+read_globals = {
+	-- Stdlib
+	string = {fields = {"split"}},
+	table = {fields = {"copy", "getn"}},
+
+	-- Minetest
+	"vector", "ItemStack",
+	"dump", "minetest",
+	"VoxelManip", "VoxelArea",
+
+	-- mods
+	"default", "mesecon", "digiline",
+	"screwdriver"
+
+}