testing/nushell: test failures on armhf

nushell has test failures on armhf and has been disabled:

failures:
    shell::environment::nu_env::local_config_should_not_be_added_when_running_scripts
    shell::pipeline::commands::external::nu_commands::echo_internally_externally
    shell::pipeline::commands::external::nu_script::run_nu_script
    shell::pipeline::commands::external::nu_script::run_nu_script_multiline

test result: FAILED. 109 passed; 4 failed; 1 ignored; 0 measured; 0 filtered out; finished in 29277.63s

Test failures

failures:
---- shell::pipeline::commands::external::nu_commands::echo_internally_externally stdout ----
=== stderr
thread 'shell::pipeline::commands::external::nu_commands::echo_internally_externally' panicked at 'assertion failed: (left == right)
left: "",
right: "foo"', tests/shell/pipeline/commands/external.rs:224:9
---- shell::pipeline::commands::external::nu_script::run_nu_script stdout ----
=== stderr
thread 'shell::pipeline::commands::external::nu_script::run_nu_script' panicked at 'assertion failed: (left == right)
left: "",
right: "done"', tests/shell/pipeline/commands/external.rs:237:9
---- shell::pipeline::commands::external::nu_script::run_nu_script_multiline stdout ----
=== stderr
thread 'shell::pipeline::commands::external::nu_script::run_nu_script_multiline' panicked at 'assertion failed: (left == right)
left: "",
right: "23"', tests/shell/pipeline/commands/external.rs:246:9
---- shell::environment::nu_env::local_config_should_not_be_added_when_running_scripts stdout ----
=== stderr
=== stderr
=== stderr
thread 'shell::environment::nu_env::local_config_should_not_be_added_when_running_scripts' panicked at 'assertion failed: (left == right)
left: "",
right: "nu"', tests/shell/environment/nu_env.rs:333:9

See: https://build.alpinelinux.org/buildlogs/build-edge-armhf/testing/nushell/nushell-0.30.0-r1.log