More template flexibility

As of deets 0.1, you can now also populate Cosmo template variables through Lua code. For example:

/tmp/silly.lua:

require("utils-grep")

local intel = grep_program_output("VGA.*Intel","lspci")

file.file({"/tmp/garbage"}, {
    ensure = "present",
    owner = "root",
    group = "root",
    mode = "755",
    source = file.cosmotemplate("/tmp/silly.cosmo", intel)
})

/tmp/silly.cosmo:

# On $systeminfo|hostname, we might have used the following information
# to populate this config file.
#
# We did not.

$map{$v|1}[[# $it]]

Then run sudo luau --rectify /tmp/silly.lua and your /tmp/garbage should be equally useless whether or not you have an Intel video card.