Add label source to dockerfile

[Erwan-loot]

This pull request makes a minor update to the Dockerfile by adding a label that references the GitHub repository source for the image. This helps improve traceability and documentation of the container image. Useful for bot like dependabot or Renovate to fetch the changelog.
source : https://docs.renovatebot.com/key-concepts/changelogs/
https://docs.renovatebot.com/modules/datasource/docker/

Summary by CodeRabbit

• Chores
  • Added a source metadata label to the Docker image. This label appears in image metadata on container registries.
  • No changes to build steps, application behavior, or runtime performance.
  • No impact on configuration, deployment steps, or user workflows.

[coderabbitai]

Walkthrough

A metadata label was added to the Dockerfile to include the repository source URL. No build steps, runtime instructions, or exported/public interfaces were changed.

Changes

Cohort / File(s)	Summary of Changes
Docker image metadata docker/Dockerfile	Added LABEL org.opencontainers.image.source="https://github.com/eduardolat/pgbackweb"; no other modifications.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

I nibble on bytes in a Docker den,
A shiny new label—source inked with a pen.
No layers shuffled, no ARGs to amend,
Just breadcrumbs of origin, neatly penned.
Hippity-hop, ship it—metadata win! 🐇📦

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title Check	✅ Passed	The title succinctly indicates that a new source label is being added to the Dockerfile, directly reflecting the primary change introduced in the pull request. It uses concise and clear phrasing without extraneous details, ensuring that teammates scanning change history can quickly grasp the update. The wording accurately focuses on the Dockerfile modification for improved traceability.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[Erwan-loot]

@coderabbitai review

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