Support running the dependency runner from the command line

Will fail currently

byg/src/Main.hs

@@ -4,7 +4,9 @@ module Main where
 import Types.Dependency (Dependency, formatDependencyTrees)
 import DependencyGenerator (evalDepGenM)
 import SiteGenerator (generateSite)
+import DependencyRunner (runDeps, runDepRunMIO)
 
+import System.Environment (getArgs)
 import qualified Data.Text.IO as T
 import Language.Haskell.TH.Syntax (lift)
 
@@ -12,4 +14,12 @@ dependencies :: [Dependency]
 dependencies = $(lift (evalDepGenM generateSite))
 
 main :: IO ()
-main = T.putStr $ formatDependencyTrees dependencies
+main = do
+  args <- getArgs
+  case args of
+    ["run"] ->
+      runDepRunMIO $ runDeps dependencies
+    ["tree"] ->
+      T.putStr $ formatDependencyTrees dependencies
+    _ ->
+      error "unexpected arguments"