Make formatter happy by splitting lines

The generated mix.exs were failing the format step in CI because the lines
where too long, by splitting the commands in different lines the formatter will
be ok with it.

installer/templates/phx_single/mix.exs

@@ -78,7 +78,9 @@ defmodule <%= @app_module %>.MixProject do
       test: ["ecto.create --quiet", "ecto.migrate --quiet", "test"]<% end %><%= if @asset_builders != [] do %>,
       "assets.setup": <%= inspect Enum.map(@asset_builders, &"#{&1}.install --if-missing") %>,
       "assets.build": <%= inspect Enum.map(@asset_builders, &"#{&1} #{@app_name}") %>,
-      "assets.deploy": <%= inspect Enum.map(@asset_builders, &"#{&1} #{@app_name} --minify") ++ ["phx.digest"] %><% end %>
+      "assets.deploy": [
+<%= Enum.map(@asset_builders, &"        \"#{&1} #{@app_name} --minify\",\n") ++ ["        \"phx.digest\""] %>
+      ]<% end %>
     ]
   end
 end

installer/templates/phx_umbrella/apps/app_name_web/mix.exs

@@ -69,7 +69,9 @@ defmodule <%= @web_namespace %>.MixProject do
       test: ["ecto.create --quiet", "ecto.migrate --quiet", "test"]<% end %><%= if @asset_builders != [] do %>,
       "assets.setup": <%= inspect Enum.map(@asset_builders, &"#{&1}.install --if-missing") %>,
       "assets.build": <%= inspect Enum.map(@asset_builders, &"#{&1} #{@web_app_name}") %>,
-      "assets.deploy": <%= inspect Enum.map(@asset_builders, &"#{&1} #{@web_app_name} --minify") ++ ["phx.digest"] %><% end %>
+      "assets.deploy": [
+<%= Enum.map(@asset_builders, &"        \"#{&1} #{@web_app_name} --minify\",\n") ++ ["        \"phx.digest\""] %>
+      ]<% end %>
     ]
   end
 end