Add label org.opencontainers.image.source

[robinschneider]

Dependency bots, like renovate, use the label org.opencontainers.image.source in order to show the release notes from a GitHub release in a PR with a container update.
This allows the user to efficiently update container images without the need to search for the release notes or jump to the repository.

Add the label org.opencontainers.image.source="https://github.com/vmware-tanzu/velero-plugin-for-aws" to the container image.
This helps for example Renovate to add Release Notes to PRs that update the container image.
https://docs.renovatebot.com/modules/datasource/docker/

[blackpiglet]

@robinschneider
Thanks for the contribution.
Could you give more information on what problem this PR resolves?

[robinschneider]

@blackpiglet I updated the PR description.

[reasonerjt]

@robinschneider

Thanks for the PR.
It looks good to me, but would you mind also updating the commit message to add the description?

[robinschneider]

@reasonerjt I updated my commit message to include a proper description.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (682678f) 20.28% compared to head (74d6208) 20.14%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #190      +/-   ##
==========================================
- Coverage   20.28%   20.14%   -0.15%     
==========================================
  Files           6        6              
  Lines         557      561       +4     
==========================================
  Hits          113      113              
- Misses        436      440       +4     
  Partials        8        8              

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[reasonerjt]

LGTM