Kubernetes tests are failing in master

[alexellis]

Kubernetes tests are failing in master

https://github.com/openfaas/certifier/runs/3856442402?check_suite_focus=true

[alexellis]

Latest failure:

2021-11-24T16:37:24.8558251Z --- FAIL: Test_Deploy_MetaData (0.38s)
2021-11-24T16:37:24.8559179Z --- PASS: Test_Deploy_MetaData/Deploy_without_any_extra_metadata (0.03s)
2021-11-24T16:37:24.8560051Z --- FAIL: Test_Deploy_MetaData/Deploy_with_labels (0.02s)
2021-11-24T16:37:24.8560921Z function_helpers_test.go:51: No such function: env-test-labels

[alexellis]

@LucasRoesler : "Are there resource constraint issues?"