test: add role fingerprints to syslog

[richm]

Test updates based on testing with bootc and on other platforms.

Summary by Sourcery

Guard syslog fingerprint verification in the default role test so it only runs when the system journal socket is present, and standardize the shell invocation to use bash.

Tests:

• Update the default role test to stat /dev/log and conditionally run journal fingerprint checks based on its presence.
• Adjust the journal fingerprint shell task to explicitly use /bin/bash for execution.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the default test playbook to only run journal-based fingerprint checks when /dev/log is present and to execute the journalctl/grep pipeline via /bin/bash, improving portability across platforms such as bootc-based systems.

File-Level Changes

Change	Details	Files
Gate journal-based role fingerprint verification on the presence of /dev/log.	Add a stat task to detect whether /dev/log exists and register the result. Conditionally set the journal start time fact only when /dev/log exists. Conditionally run the journalctl-based fingerprint verification task only when /dev/log exists.	tests/tests_default.yml
Make the journalctl/grep fingerprint check use an explicit Bash shell configuration.	Change the fingerprint check task to use the Ansible shell module with explicit executable /bin/bash. Move the journalctl/grep pipeline into the cmd parameter of the shell module while preserving existing error handling and behavior.	tests/tests_default.yml

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 10.16%. Comparing base (59fd1c6) to head (e100572).
⚠️ Report is 137 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (59fd1c6) and HEAD (e100572). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (59fd1c6)	HEAD (e100572)
sanity	1	0

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #615      +/-   ##
==========================================
- Coverage   16.54%   10.16%   -6.39%     
==========================================
  Files           2        9       +7     
  Lines         284     2056    +1772     
  Branches       79        0      -79     
==========================================
+ Hits           47      209     +162     
- Misses        237     1847    +1610     

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