External DNS should uses ALIAS for AWS Global Accelerator

[Reuuke]

External DNS should use ALIAS for AWS Global Accelerator instead of CNAME.

ZoneId defined there: https://docs.aws.amazon.com/Route53/latest/APIReference/API_AliasTarget.html

DNS name defined there:
https://docs.aws.amazon.com/global-accelerator/latest/dg/introduction-components.html

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[njuettner]

@Reuuke thanks for the addition, did you had time to test this? I'm curious if it works with external-dns.

[Reuuke]

@Reuuke thanks for the addition, did you had time to test this? I'm curious if it works with external-dns.

Yes, it has been working in our LAB environment for 10 days.
During this time I did a lot of tests with switching from NLB to AWS Global Accelerator -
all were successful.

[fejta-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
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If this issue is safe to close now please do so with /close.

Send feedback to sig-testing, kubernetes/test-infra and/or fejta.
/lifecycle stale

[seanmalloy]

/kind feature
/remove-lifecycle stale

[seanmalloy]

/lgtm

[vinny-sabatini]

LGTM
/assign @Raffo @njuettner

[njuettner]

/approve

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This pull-request has been approved by: njuettner, Reuuke

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