[bitnami/external-dns] Allow rfc2136-zone to specify multiple zones

[opencmit2]

Description of the change

• Modified Helm template to handle single string or list values for extraArgs.

This change allows specifying more than two rfc2136 zones in the values.yaml file, addressing the limitation where only two zones could be provided.

Benefits

Possible drawbacks

Applicable issues

• fixes [bitnami/external-dns] External dns rfc2136 zone cannot supply more than 2 zones. #28645

Additional information

Checklist

• Chart version bumped in Chart.yaml according to semver. This is not necessary when the changes only affect README.md files.
• Variables are documented in the values.yaml and added to the README.md using readme-generator-for-helm
• Title of the pull request follows this pattern [bitnami/<name_of_the_chart>] Descriptive title
• All commits signed off and in agreement of Developer Certificate of Origin (DCO)

[fmulero]

Hi @opencmit2 thanks a lot for your contribution.

It looks good but I have a little concern, because there is unnecessary complexity around this extraArgs feature. Could you give it a glance and share your thoughts?

[opencmit2]

@fmulero I did what you said, but I didn't test it successfully and it's not clear if it's compatible with previous versions

[opencmit2]

[github-actions]

This Pull Request has been automatically marked as "stale" because it has not had recent activity (for 15 days). It will be closed if no further activity occurs. Thank you for your contribution.

[github-actions]

Due to the lack of activity in the last 5 days since it was marked as "stale", we proceed to close this Pull Request. Do not hesitate to reopen it later if necessary.

[TomyLobo]

this PR would be useful to me

[fmulero]

LGTM