feat(chart): allow to run tpl on ServiceAccount annotations

[fcrespofastly]

Description

The basic use-case is to add dynamic environmental metadata to external-dns KSA so we can take advantage of advanced cloud IAM features such as IRSA or Workload Identity. We already provide the necessary metadata through values so we could DRY those values and render them in values files. For instance:

serviceAccount:
  annotations:
    iam.gke.io/gcp-service-account: "external-dns@{{ .Values.metadata.gcpProject }}.iam.gserviceaccount"

This change doesn't break any previous behavior.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: fcrespofastly / name: Fernando Crespo Grávalos (8114c5c, 0a3cbfd)

[k8s-ci-robot]

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[k8s-ci-robot]

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[fcrespofastly]

Hey @szuecs @stevehipwell 👋🏻 !

How do you feel about this change? it should be basically noop, can we launch the tests?

[fcrespofastly]

I also updated the CHANGELOG adding an entry under UNRELEASED.

@szuecs @stevehipwell ☝🏻 I think that's correct right?

[mloiseleur]

/ok-to-test
/lgtm
/retitle feat(chart): allow to run tpl on ServiceAccount annotations

[mloiseleur]

/assign @stevehipwell
/unassign @szuecs