chore(ckan/dependencies): pin ghcr.io/teutonet/oci-images/ckan docker tag to 615da29

[renovate]

This PR contains the following updates:

Package	Update	Change
ghcr.io/teutonet/oci-images/ckan	pinDigest	-> 615da29

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[teutonet-bot]

🤖 I have diffed this beep boop

"/$namespace/$kind/$name.yaml" for normal resources
"/$namespace/HelmRelease/$name/$namespace/$kind/$name.yaml" for HelmReleases <- this is recursive
'null' means it's either cluster-scoped or it's in the default namespace for the HelmRelease

charts/ckan/values.yaml has no changes

charts/ckan/ci/smtp-values.yaml has no changes

charts/ckan/ci/persistence-values.yaml has no changes

charts/ckan/ci/artifacthub-values.yaml has no changes

charts/ckan/ci/ckan-custom-values.yaml has no changes