feat: ensure role works on ostree systems

Ensure role works on ostree systems

Signed-off-by: Rich Megginson <rmeggins@redhat.com>

.ostree/packages-runtime.txt

@@ -0,0 +1,2 @@
+aide
+crontabs

tests/tests_check_cron.yml

@@ -3,9 +3,24 @@
 - name: Ensure that the cron is set up
   hosts: all
   tasks:
+    - name: Determine if system is ostree and set flag
+      when: not __aide_is_ostree is defined
+      block:
+        - name: Check if system is ostree
+          stat:
+            path: /run/ostree-booted
+          register: __ostree_booted_stat
+
+        - name: Set flag to indicate system is ostree
+          set_fact:
+            __aide_is_ostree: "{{ __ostree_booted_stat.stat.exists }}"
+
     - name: Install crontabs
       package:
         name: crontabs
+        state: present
+        use: "{{ (__aide_is_ostree | d(false)) |
+                ternary('ansible.posix.rhel_rpm_ostree', omit) }}"
 
     - name: Create tempfile for crontab backup
       tempfile: