The custom flag moves from 33 hardcoded template kwargs into the merged
service config: 'custom: true' names the shared <entity>_custom build,
a string names a second distinct '<string>_custom' image inside one app
(nextcloud whiteboard). The image lookup reads the declaration as a
fallback, so config consumers (e.g. backup image matching) resolve the
exact deployed reference from one declaration point. nextcloud cron now
runs the nextcloud_custom build like the app service instead of the
upstream image.
A new services lint couples the declaration to reality in both
directions: custom requires a role Dockerfile, and a role Dockerfile
requires a custom declaration. The eight legacy roles deploying local
builds under upstream tags or ad-hoc image= overrides are ratcheted via
'# nocheck: dockerfile-custom'.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
kevinveenbirkenbachandClaude Fable 5