[Minor] Add alzip magic numbers

lualib/lua_magic/patterns.lua

@@ -254,6 +254,26 @@ local patterns = {
       },
     }
   },
+  egg = {
+    -- ALZip egg
+    matches = {
+      {
+        string = [[EGGA]],
+        weight = 60,
+        relative_position = 0,
+      },
+    }
+  },
+  alz = {
+    -- ALZip alz
+    matches = {
+      {
+        string = [[ALZ\x{01}]],
+        weight = 60,
+        relative_position = 0,
+      },
+    }
+  },
   -- Apple is a 'special' child: this needs to be matched at the data tail...
   dmg = {
     matches = {

lualib/lua_magic/types.lua

@@ -117,6 +117,14 @@ local types = {
     ct = 'application/x-zoo',
     type = 'archive',
   },
+  egg = {
+    ct = 'application/x-egg',
+    type = 'archive',
+  },
+  alz = {
+    ct = 'application/x-alz',
+    type = 'archive',
+  },
   xar = {
     ct = 'application/x-xar',
     type = 'archive',