chore: add OCI standard labels to Dockerfile

[Erwan-loot]

Context

The Docker images published by this project (ghcr.io/lissy93/web-check, docker.io/lissy93/web-check) are missing standard OCI Image Spec labels. Adding these improves:

• Dependency bot changelogs: Renovate and Dependabot use org.opencontainers.image.source to locate and display changelogs/release notes in update PRs
• Registry UI: GHCR and Docker Hub display OCI labels (description, license, source link) in their web interface
• Security scanning: Tools like Trivy and Grype use source and revision for image provenance
• Image traceability: version, revision, and created enable precise build auditing

Type

Improvement — metadata only, no functional changes.

Labels Added

Label	Value	Source
org.opencontainers.image.title	Web-Check	Static (Dockerfile) + auto-generated (CI)
org.opencontainers.image.description	All-in-one OSINT tool for analysing any website	Static (Dockerfile) + auto-generated (CI)
org.opencontainers.image.url	https://web-check.xyz	Static (Dockerfile) + auto-generated (CI)
org.opencontainers.image.source	https://github.com/lissy93/web-check	Static (Dockerfile) + auto-generated (CI)
org.opencontainers.image.licenses	MIT	Static (Dockerfile)
org.opencontainers.image.vendor	Alicia Sykes	Static (Dockerfile)
org.opencontainers.image.version	git tag / ref	Dynamic (CI via docker/metadata-action)
org.opencontainers.image.revision	git SHA	Dynamic (CI via docker/metadata-action)
org.opencontainers.image.created	build timestamp	Dynamic (CI via docker/metadata-action)

Changes

Dockerfile — static labels added to the final stage (after ENV, before CMD), covering manual docker build invocations without CI:

LABEL org.opencontainers.image.title="Web-Check" \
      org.opencontainers.image.description="All-in-one OSINT tool for analysing any website" \
      org.opencontainers.image.url="https://web-check.xyz" \
      org.opencontainers.image.source="https://github.com/lissy93/web-check" \
      org.opencontainers.image.licenses="MIT" \
      org.opencontainers.image.vendor="Alicia Sykes"

.github/workflows/docker.yml — adds docker/metadata-action@v5 to generate the dynamic labels (version, revision, created) from GitHub context, and wires them into the existing docker/build-push-action@v7 step via labels: ${{ steps.meta.outputs.labels }}. The existing tag logic is unchanged.

Verification

After merge, labels can be verified with:

docker inspect ghcr.io/lissy93/web-check:latest | jq '.[0].Config.Labels'

References

• OCI Image Spec - Annotations
• Renovate Docker datasource
• docker/metadata-action

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