Always run build:css on install

So application.css is never missing

Author: dhh

lib/install/bootstrap/install.rb

@@ -17,4 +17,5 @@
   say %(Add "scripts": { "build:css": "#{build_script}" } to your package.json), :green
 else
   run %(npm set-script build:css "#{build_script}")
+  run %(yarn build:css)
 end

lib/install/bulma/install.rb

@@ -10,4 +10,5 @@
   say %(Add "scripts": { "build:css": "#{build_script}" } to your package.json), :green
 else
   run %(npm set-script build:css "#{build_script}")
+  run %(yarn build:css)
 end

lib/install/postcss/install.rb

@@ -10,4 +10,5 @@
   say %(Add "scripts": { "build:css": "#{build_script}" } to your package.json), :green
 else
   run %(npm set-script build:css "#{build_script}")
+  run %(yarn build:css)
 end

lib/install/sass/install.rb

@@ -9,4 +9,5 @@
   say %(Add "scripts": { "build:css": "#{build_script}" } to your package.json), :green
 else
   run %(npm set-script build:css "#{build_script}")
+  run %(yarn build:css)
 end

lib/install/tailwind/install.rb

@@ -10,4 +10,5 @@
   say %(Add "scripts": { "build:css": "#{build_script}" } to your package.json), :green
 else
   run %(npm set-script build:css "#{build_script}")
+  run %(yarn build:css)
 end