roles/single: update cron presence check

Check if `crontab` file exists as it is possible that OS has a package named differently from default "cron". Checking against binary name presence is safer and expected to cover all cases.

Signed-off-by: Zakhar Bessarab <[email protected]>

roles/single/tasks/configure.yml

@@ -42,14 +42,10 @@
     name: victoriametrics
     enabled: true
 
-- name: Gather package facts
-  ansible.builtin.package_facts:
-    manager: auto
-
 - name: Configure credentials
   when:
     - victoriametrics_backup_enabled | bool
-    - "'cron' in ansible_facts.packages"
+    - crontab_which.rc == 0
   block:
     - name: Create aws credentials dir
       become: true
@@ -105,4 +101,4 @@
     state: absent
   when:
     - not victoriametrics_backup_enabled | bool
-    - "'cron' in ansible_facts.packages"
+    - crontab_which.rc == 0

roles/single/tasks/preinstall.yml

@@ -28,3 +28,10 @@
   check_mode: false
   register: victoriametrics_current_version
   when: victoriametrics_is_installed.stat.exists | bool
+
+- name: Check if crontab is present
+  ansible.builtin.raw: which crontab
+  check_mode: false
+  changed_when: false
+  failed_when: false
+  register: crontab_which