Hey @gruset welcome
Yes you can read files with the Nakama module in the Lua runtime. The function is called file_read(somepath)
and can be imported into your module as part of the Nakama framework. i.e.
local nk = require('nakama')
-- somewhere in your code
nk.file_read('some/path/to/file.ext')
The path specified will always be relative to the --runtime.path
directory.
Hope this helps.