Allow for User API tokens to be used with DNSimple

[IntegralProgrammer]

Description

This Pull Request introduces the following environment variables for overriding data retrieved from the DNSimple API. This is needed when using User API DNSimple tokens (as opposed to Account API DNSimple tokens) as this data cannot be accessed with a User API token:

• DNSIMPLE_ACCOUNT_ID: The DNSimple account which owns the DNS records to be updated
• DNSIMPLE_ZONES: A comma separated list of DNS Zones in DNSimple which External-DNS will be allowed to manipulate

Fixes #4273

Checklist

• [x] Unit tests updated
• [x] End user documentation updated

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: IntegralProgrammer / name: Michael Lescisin (660b20b4425da537b324f65c627b0483ea3319d0, d475eb65576291ec9b1e35bec0a3e5c4dd198914, 9b3c2857767b1f245fb4d886cfa38f987d328e1f, 26694e4b2669e8f7baa29366a0455c362ae660c1, acf188f7199dab55538aa8465cedaa188df90ada, d0c121b97cb7da27e07404ef16e04ca776d23549, ea2d25948531da2e9c5a8c6af19016e4e047f247, 3babcbcd72360470b423a22033c8c6f75d9dcbda, 9c24ecc1084c4eff695da14e1e6b1ef1b9202b77, 3eb852fe2acda27f3bf15f75908de2ba966faa34, c54a9a8df2e806f11441ce72820cdb978be3d97c, 487501d923a59cb9e93ec3ebf4ef5447476540a7, eb59b9bd4d6eca06759540e6758540a46fd9b441, ed3efdb2608af0c387bba69ad6440e4f3f2c5c30)

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[k8s-ci-robot]

Hi @IntegralProgrammer. Thanks for your PR.

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[szuecs]

@IntegralProgrammer every feature requires a test.

[IntegralProgrammer]

@IntegralProgrammer every feature requires a test.

Thank you for your feedback - I have added tests for this new feature in provider/dnsimple/dnsimple_test.go and have updated the documentation in docs/tutorials/dnsimple.md.

[mloiseleur]

/ok-to-test

[mloiseleur]

@IntegralProgrammer Thanks. Now you need to fix what is required by the linter. you can test it locally with make lint

[mloiseleur]

/retitle feat(DNSimple): User API tokens

[IntegralProgrammer]

See my last suggestion about dnsimpleAccountId + Wdyt about keeping only NewDnsimpleProvider func without adding BuildDnsimpleProvider ?

I've removed the need for the dnsimpleAccountId variable in commit https://github.com/kubernetes-sigs/external-dns/pull/4274/commits/487501d923a59cb9e93ec3ebf4ef5447476540a7 and have refactored the code in dnsimple_test.go using a type assertion so that BuildDnsimpleProvider is no longer needed - https://github.com/kubernetes-sigs/external-dns/pull/4274/commits/ed3efdb2608af0c387bba69ad6440e4f3f2c5c30

[mloiseleur]

/lgtm

[szuecs]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: szuecs

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