Remove file function wrapper from ssh_auth_key variable

[dpatrick]

Fixes #576

I looked back at the git history and found this regression was introduced when the config sync module was added, though it applies to the acm module as well.

[bharathkkb]

@morgante do you know what those extra triggers are? I see that in the main build too where both int and lint are green.

[bharathkkb]

Thanks for the PR! 🚀
I think we should also update the description for

terraform-google-kubernetes-engine/modules/k8s-operator-crd-support/variables.tf

Line 85 in c05c48e

variable "ssh_auth_key" {

[morgante]

@morgante do you know what those extra triggers are? I see that in the main build too where both int and lint are green.

It's the same triggers, but it looks like Cloud Build has yet again chained the names they send back.