Merge remote-tracking branch 'mt-mods/master'

Deprecated declaration group

.github/workflows/luacheck.yml

@@ -4,7 +4,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@master
+    - uses: actions/checkout@main
     - name: apt
       run: sudo apt-get install -y luarocks
     - name: luacheck install

init.lua

@@ -137,8 +137,8 @@ for material, m in pairs(materials) do
 				["armor_"..p.place] = math.floor(p.level * m.armor),
 				armor_heal = m.heal,
 				armor_use = m.use,
-				armor_radiation = math.floor(p.radlevel * m.radiation)
-			}
+			},
+			armor_groups = { radiation = math.floor(p.radlevel * m.radiation)},
 		})
 		minetest.register_craft({
 			output = name,