fix(setup): be sure to use rsync checksum option

Files that were coincidentally timestamped the same (because NPM
packages all use the same 1985 timestamp), and had the same size
were not properly synchronized.

setup/ansible/roles/copy/tasks/main.yml

@@ -19,12 +19,13 @@
     path: "/usr/src/cosmic-workspace"
   register: ws
 
-- name: Synchronize install directory
+- name: "Synchronize install directory {{APPDIR}}"
   synchronize:
     src: "{{APPDIR}}/"
     dest: "/usr/src/cosmic-swingset/"
     dirs: yes
     delete: yes
+    checksum: yes
     mode: push
     rsync_opts:
     - "--exclude=.git"
@@ -42,6 +43,7 @@
     dest: "/usr/src/cosmic-workspace/"
     dirs: yes
     delete: yes
+    checksum: yes
     mode: push
   when: ws.stat.exists