chore: add OCI standard labels to Dockerfile templates

[Erwan-loot]

Context

Add OCI (Open Container Initiative) standard labels to Dockerfile-debian.template and Dockerfile-alpine.template for better image metadata and container registry compatibility.

Type

Improvement — metadata only, no functional changes.

Labels Added

Label	Value	Source
org.opencontainers.image.title	Nextcloud	Static
org.opencontainers.image.description	A safe home for all your data. Access & share your files, calendars, contacts, mail & more from any device, on your terms.	Static
org.opencontainers.image.url	https://nextcloud.com	Static
org.opencontainers.image.source	https://github.com/nextcloud/docker	Static
org.opencontainers.image.documentation	https://hub.docker.com/_/nextcloud	Static
org.opencontainers.image.vendor	Nextcloud GmbH	Static
org.opencontainers.image.licenses	AGPL-3.0-or-later	Static
org.opencontainers.image.version	%%VERSION%% → e.g. 33.0.2	Template variable (existing sed substitution)

The %%VERSION%% placeholder is already used in ENV NEXTCLOUD_VERSION %%VERSION%% and is replaced globally by update.sh, so it works in the LABEL instruction with no changes required to update.sh.

The LABEL block is placed after the final COPY instructions and before ENTRYPOINT, which avoids cache invalidation for the expensive build steps above.

Benefits

• Registry Compatibility: GHCR, Docker Hub, and other registries display these labels in their UI
• Dependency Bot Changelogs: Renovate and Dependabot use org.opencontainers.image.source to link release notes in update PRs
• Image Provenance: Track source code and version information for security audits
• Standardization: Follow OCI best practices for container image metadata

Changes

• Dockerfile-debian.template — added 8-label LABEL block before ENTRYPOINT
• Dockerfile-alpine.template — added 8-label LABEL block before ENTRYPOINT

The generated Dockerfiles (32/, 33/ × apache/fpm/fpm-alpine) will be automatically updated on the next run of update.sh (triggered by the update-sh.yml CI workflow after merge).

How to verify

After image build:

docker inspect <image> --format '{{ json .Config.Labels }}' | jq

References

• OCI Image Spec - Annotations
• Renovate Docker datasource
• Docker - Manage tags and labels

Signed-off-by: Erwan Hervé erwan.herve+claude@outlook.fr

[Copilot]

Pull request overview

Adds OCI (Open Container Initiative) standard image labels to the Debian and Alpine Dockerfile templates to improve published image metadata in registries without changing build/runtime behavior.

Changes:

• Add an OCI LABEL block to Dockerfile-debian.template (title, description, url, source, documentation, vendor, licenses, version).
• Add the same OCI LABEL block to Dockerfile-alpine.template.
• Reuse the existing %%VERSION%% template substitution performed by update.sh (no script changes required).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
Dockerfile-debian.template	Adds OCI standard labels near the end of the template, using %%VERSION%% for org.opencontainers.image.version.
Dockerfile-alpine.template	Adds the same OCI standard labels near the end of the template, using %%VERSION%% for org.opencontainers.image.version.

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