testsuite failure on ppc64le

Also when attempting to build the APK on the gitlab runner on ppc64le in alpine/aports!47368 (merged)

===> tests/tiny-cloud.test:no_userdata_main
Result:     failed: atf-check failed; see the output of the test for details
Start time: 2023-05-21T21:49:06.494833Z
End time:   2023-05-21T21:49:06.594419Z
Duration:   0.100s
Metadata:
    allowed_architectures is empty
    allowed_platforms is empty
    description is empty
    has_cleanup = false
    is_exclusive = false
    required_configs is empty
    required_disk_space = 0
    required_files is empty
    required_memory = 0
    required_programs is empty
    required_user is empty
    timeout = 300
Standard output:
Executing command [ tiny-cloud main ]
Standard error:
Fail: regexp failed is in stderr
   ++ missing_userdata: starting
missing_userdata: no user-data found
   ++ missing_userdata: done
   ++ set_hostname: starting
mount: mounting LABEL=cidata on /tmp/kyua.ajLcCi/77/work/run/tiny-cloud/cidata-OiJgfK failed: Function not implemented
mount: mounting LABEL=CIDATA on /tmp/kyua.ajLcCi/77/work/run/tiny-cloud/cidata-OiJgfK failed: Function not implemented
mount: mounting LABEL=cidata on /tmp/kyua.ajLcCi/77/work/run/tiny-cloud/cidata-OiJgfK failed: Function not implemented
mount: mounting LABEL=CIDATA on /tmp/kyua.ajLcCi/77/work/run/tiny-cloud/cidata-OiJgfK failed: Function not implemented
imds[4130]: Unable to load NoCloud datasource
set_hostname: no hostname set
   ++ set_hostname: done
   ++ set_ssh_keys: starting
mount: mounting LABEL=cidata on /tmp/kyua.ajLcCi/77/work/run/tiny-cloud/cidata-bJAFnM failed: Function not implemented
mount: mounting LABEL=CIDATA on /tmp/kyua.ajLcCi/77/work/run/tiny-cloud/cidata-bJAFnM failed: Function not implemented
mount: mounting LABEL=cidata on /tmp/kyua.ajLcCi/77/work/run/tiny-cloud/cidata-bJAFnM failed: Function not implemented
mount: mounting LABEL=CIDATA on /tmp/kyua.ajLcCi/77/work/run/tiny-cloud/cidata-bJAFnM failed: Function not implemented
imds[4834]: Unable to load NoCloud datasource
set_ssh_keys: no ssh key found
   ++ set_ssh_keys: done
Files left in work directory after failure: run, var
===> Failed tests
tests/tiny-cloud.test:no_userdata_main  ->  failed: atf-check failed; see the output of the test for details  [0.100s]

Originally reported as #42 (comment 308323)