rails new

THOR_MERGE=vimdiff bundle exec rails new -d mysql --skip-action-mailbox
  --skip-action-text --skip-active-job --skip-active-storage
  --skip-action-cable --skip-hotwire --skip-jbuilder --skip-bootsnap
  --skip-bundle .

app/assets/config/manifest.js

@@ -0,0 +1,2 @@
+//= link_tree ../images
+//= link_directory ../stylesheets .css

app/assets/stylesheets/application.css

@@ -0,0 +1,15 @@
+/*
+ * This is a manifest file that'll be compiled into application.css, which will include all the files
+ * listed below.
+ *
+ * Any CSS (and SCSS, if configured) file within this directory, lib/assets/stylesheets, or any plugin's
+ * vendor/assets/stylesheets directory can be referenced here using a relative path.
+ *
+ * You're free to add application-wide styles to this file and they'll appear at the bottom of the
+ * compiled file so the styles you add here take precedence over styles defined in any other CSS
+ * files in this directory. Styles in this file should be added after the last require_* statement.
+ * It is generally better to create a new file per style scope.
+ *
+ *= require_tree .
+ *= require_self
+ */