fix: wrong depName for gotemplate + spurious empty registryUrl warning

[amuraru]

Summary

Follow-up to #285. Both bugs fixed here only surfaced after #285 merged and Renovate re-evaluated master — visible in the Mend job log (https://developer.mend.io/github/adobe/koperator) and reflected in PR #279 / the Dependency Dashboard (#156):

WARN: Package lookup failures (branch="renovate/master-all-minor-patch")
{ "warnings": ["Failed to look up github-releases package cznic/gotemplate: no-result"], "files": ["Makefile"] }

WARN: Invalid regex manager registryUrl
{ "baseBranch": "master", "value": "" }

Changes

1. Wrong depName: Makefile's GOTEMPLATE_VERSION annotation said depName=cznic/gotemplate, but the Makefile actually does go install github.com/coveooss/gotemplate/v3@v$(GOTEMPLATE_VERSION) a few lines down. cznic/gotemplate doesn't exist on GitHub (confirmed 404), so the lookup could never succeed — likely a copy-paste slip from whoever originally annotated it. Fixed to depName=coveooss/gotemplate, which exists and has a v3.12.0 release matching the currently pinned version.

2. Spurious empty-string registryUrl warning: fix: unblock two more dependencies silently dropped by Renovate customManagers #285's fix for ZookeeperOperatorVersion (datasource=docker) made registryUrl optional in the regex, but registryUrlTemplate still rendered to "" for it, since docker deps have no Helm-repo registryUrl. A templated empty string is still a defined (invalid) registryUrl to Renovate, not the same as omitting it — hence the warning. Split the customManager into two: the original, unchanged, for Helm entries that always carry a registryUrl, plus a new one scoped to the literal datasource=docker (RE2 has no lookaround, so this is how the split avoids overlap without negative-lookahead tricks) that never defines registryUrlTemplate at all. Renovate then auto-derives the registry from the image name itself.

Test plan

Per feedback on the previous PR, verified with a real renovate run instead of just the config validator:

• renovate-config-validator passes
• renovate --platform=local --dry-run=full (LOG_LEVEL=debug) run end-to-end against this branch, with real datasource lookups. Confirmed in the output:
  • coveooss/gotemplate resolves cleanly, warnings: []
  • ghcr.io/adobe/helm-charts/zookeeper-operator extracted with registryUrl auto-derived as https://ghcr.io, warnings: []
  • apache/kafka (from fix: make Renovate actually track the Kafka docker image version #284) still tracked, updates: [] — 3.9.2 is in fact the latest 3.x release, nothing newer within the allowedVersions "<4.0.0" pin (confirmed against GitHub tags directly)
  • zero occurrences of "invalid regex", "lookup fail", or "no-result" anywhere in the full run log

🤖 Generated with Claude Code