Create the mastodon home directory in the dependencies recipe

The user resource does not manage the home directory, so removing /opt/mastodon broke the build phase when it tried to create /opt/mastodon/.ssh.

site-cookbooks/kosmos-mastodon/recipes/dependencies.rb

@@ -62,6 +62,12 @@ user mastodon_user do
   home mastodon_path
 end
 
+directory mastodon_path do
+  owner mastodon_user
+  group mastodon_user
+  mode  "0755"
+end
+
 # Mastodon 4.6 dropped ImageMagick in favor of libvips and requires libvips >= 8.13
 package %w(build-essential ffmpeg libxml2-dev libxslt1-dev file git
            curl pkg-config libprotobuf-dev protobuf-compiler libidn-dev