scaleway: get credentials from Scaleway profile

[Mia-Cross]

The Scaleway Developer Tools ecosystem allows users to define profiles in a yaml file that looks like this :

profiles:
  default-profile:
    access_key: SCWXXXXXXXXXXXXXXXX
    secret_key: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
    default_project_id: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
    default_zone: fr-par-1
    default_region: fr-par

This PR adds the possibility for kOps to get the credentials from this file rather than from the environment by defining SCW_PROFILE=default-profile in the environment.

They can still choose to provide their credentials by defining SCW_ACCESS_KEY, SCW_SECRET_KEY and SCW_DEFAULT_PROJECT_ID but I will update the documentation in #14735 in order to encourage them to use the profiles instead since it's more secure.

[k8s-ci-robot]

Hi @Mia-Cross. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[hakman]

/ok-to-test

[hakman]

/retest

[hakman]

Seems a good approach. Thanks @Mia-Cross.
I think we are getting close now :).

[k8s-ci-robot]

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