Update docker.io/bitnami/external-dns Docker tag to v0.15.1-debian-12-r0 #899

Job	Run time
mkdocs-gh-pages-deployment	20s
markdown-check / markdown-check	1m 26s
deploy-to-ghcr / build-push-image	50s
pr-labelling / labeler	6s
repo-standard / validate-name	31s
yaml-check / yaml-lint-check	7s
terraform-check / terraform-format-check	7s
deploy-to-ghcr / remove-old-image	9s
	3m 36s

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