Migrate capi digitalocean creds to community cluster

[upodroid]

This PR allows us to move 21 CAPI DigitalOcean jobs to community infrastructure.

https://github.com/kubernetes/test-infra/blob/master/docs/job-migration-todo.md

/cc @dims @BenTheElder @ameukam

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BenTheElder, upodroid

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Needs approval from an approver in each of these files:

• ~~infra/aws/terraform/prow-build-cluster/OWNERS~~ [BenTheElder,upodroid]
• ~~infra/gcp/terraform/k8s-infra-prow-build/prow-build/resources/OWNERS~~ [BenTheElder,upodroid]

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[BenTheElder]

Hopefully also the ~6 kOps D.O. jobs

[upodroid]

Hopefully also the ~6 kOps D.O. jobs

I added all the creds now

[upodroid]

/hold cancel