perform task only if some file does not exist

roles/mastodon/tasks/system_setup/mastodon.yml

@@ -10,6 +10,9 @@
     args:
       chdir: "{{ mastodon_home }}/{{ mastodon_path }}"
 
+  - stat: path={{ mastodon_home }}/{{ mastodon_path }}/.env.production
+    register: production_config
+
   - name: Bundle install
     shell: |
       {{ mastodon_home }}/.rbenv/shims/bundle config set --local deployment 'true' && \
@@ -18,11 +21,13 @@
       {{ mastodon_home }}/.rbenv/shims/bundle install -j$(getconf _NPROCESSORS_ONLN)
     args:
       chdir: "{{ mastodon_home }}/{{ mastodon_path }}"
+    when: not production_config.stat.exists
 
   - name: Yarn install
     command: yarn install --pure-lockfile
     args:
       chdir: "{{ mastodon_home }}/{{ mastodon_path }}"
+    when: not production_config.stat.exists
 
   - name: Media cleanup cronjob
     cron:
@@ -30,9 +35,7 @@
       minute: "15"
       hour: "1"
       job: '/bin/bash -c ''export PATH="$HOME/.rbenv/bin:$PATH"; eval "$(rbenv init -)"; cd {{ mastodon_home }}/{{ mastodon_path }} && RAILS_ENV=production ./bin/tootctl media remove'''
-
-  - stat: path={{ mastodon_home }}/{{ mastodon_path }}/.env.production
-    register: production_config
+    when: not production_config.stat.exists
 
   - name: Migrate database
     shell: "RAILS_ENV=production {{ mastodon_home }}/.rbenv/shims/bundle exec rails db:migrate"