Image test failure on grep during "check_dest"

[prestist]

Bug

When submitting any PR to Coreos-installer we see failure on the image test check.

Expected Behavior

CI passes while checking

check_dest() {
    ! assert @applied-live-ign@
    ! assert @applied-live-2-ign@
    assert @applied-dest-ign@
    assert @applied-dest-2-ign@
    ! assert @preinst-1@
    ! assert @preinst-2@
    ! assert @postinst-1@
    ! assert @postinst-2@
    assert 'Adding "coreos-installer test certificate" to list of CAs'
}

Actual Behavior

The * are the asserts which are reporting incorrectly inside the check_dest()

[2024-05-28T17:57:22.885Z] 314: check_dest
[2024-05-28T17:57:22.885Z] 182: assert @applied-live-ign@
[2024-05-28T17:57:22.885Z] 148: grep -Fq @applied-live-ign@ log
[2024-05-28T17:57:22.885Z] 151: echo 'Assertion failed: '\''@applied-live-ign@'\'' not found in log'
[2024-05-28T17:57:22.885Z] Assertion failed: '@applied-live-ign@' not found in log
[2024-05-28T17:57:22.885Z] 183: assert @applied-live-2-ign@
[2024-05-28T17:57:22.885Z] 148: grep -Fq @applied-live-2-ign@ log
[2024-05-28T17:57:22.885Z] 151: echo 'Assertion failed: '\''@applied-live-2-ign@'\'' not found in log'
[2024-05-28T17:57:22.885Z] Assertion failed: '@applied-live-2-ign@' not found in log
[2024-05-28T17:57:22.885Z] 184: assert @applied-dest-ign@
[2024-05-28T17:57:22.885Z] 148: grep -Fq @applied-dest-ign@ log
**[2024-05-28T17:57:22.885Z] 151: echo 'Assertion failed: '\''@applied-dest-ign@'\'' not found in log'**
[2024-05-28T17:57:22.885Z] Assertion failed: '@applied-dest-ign@' not found in log
[2024-05-28T17:57:22.885Z] 185: assert @applied-dest-2-ign@
[2024-05-28T17:57:22.885Z] 148: grep -Fq @applied-dest-2-ign@ log
[2024-05-28T17:57:22.885Z] 149: echo 'Assertion passed: '\''@applied-dest-2-ign@'\'' found in log'
[2024-05-28T17:57:22.885Z] Assertion passed: '@applied-dest-2-ign@' found in log
[2024-05-28T17:57:22.885Z] 186: assert @preinst-1@
[2024-05-28T17:57:22.885Z] 148: grep -Fq @preinst-1@ log
[2024-05-28T17:57:22.885Z] 151: echo 'Assertion failed: '\''@preinst-1@'\'' not found in log'
[2024-05-28T17:57:22.885Z] Assertion failed: '@preinst-1@' not found in log
[2024-05-28T17:57:22.885Z] 187: assert @preinst-2@
[2024-05-28T17:57:22.885Z] 148: grep -Fq @preinst-2@ log
[2024-05-28T17:57:22.885Z] 151: echo 'Assertion failed: '\''@preinst-2@'\'' not found in log'
[2024-05-28T17:57:22.885Z] Assertion failed: '@preinst-2@' not found in log
[2024-05-28T17:57:22.885Z] 188: assert @postinst-1@
[2024-05-28T17:57:22.885Z] 148: grep -Fq @postinst-1@ log
[2024-05-28T17:57:22.885Z] 151: echo 'Assertion failed: '\''@postinst-1@'\'' not found in log'
[2024-05-28T17:57:22.885Z] Assertion failed: '@postinst-1@' not found in log
[2024-05-28T17:57:22.885Z] 189: assert @postinst-2@
[2024-05-28T17:57:22.885Z] 148: grep -Fq @postinst-2@ log
[2024-05-28T17:57:22.885Z] 151: echo 'Assertion failed: '\''@postinst-2@'\'' not found in log'
[2024-05-28T17:57:22.885Z] Assertion failed: '@postinst-2@' not found in log
[2024-05-28T17:57:22.885Z] 190: assert 'Adding "coreos-installer test certificate" to list of CAs'
[2024-05-28T17:57:22.885Z] 148: grep -Fq 'Adding "coreos-installer test certificate" to list of CAs' log
[2024-05-28T17:57:22.885Z] 149: echo 'Assertion passed: '\''Adding "coreos-installer test certificate" to list of CAs'\'' found in log'
[2024-05-28T17:57:22.885Z] Assertion passed: 'Adding "coreos-installer test certificate" to list of CAs' found in log

Reproduction Steps

1. Create a PR with any content
2. See failing CI.

Other Information

This issue seems to stem from something external.