Fix shell_module executable and mail healthcheck

playbooks/roles/healthcheck/tasks/systemd.yml

@@ -14,6 +14,7 @@
 
 - name: Get all healthcheck timers
   ansible.builtin.shell:  # noqa: command-instead-of-module
+    executable: /usr/bin/bash
     cmd: "set -o pipefail && systemctl list-timers 'healthcheck@*' --all --output=json | jq -r '.[].unit'"
   register: systemd_timers_result
   changed_when: false