DOCKER-164: Add org.opencontainers.image.url label

[candrews]

Add the org.opencontainers.image.url label to the docker image.

These annotations are useful for people to manual use as well as for use by tools. For example, Snyk uses them in its UI and Renovate uses them to find release notes.

See: https://github.com/opencontainers/image-spec/blob/main/annotations.md#pre-defined-annotation-keys

See: SonarSource/sonar-scanner-cli-docker#160

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Please ensure your pull request adheres to the following guidelines:

• explain your motives to contribute this change: what problem you are trying to fix, what improvement you are trying to make
• If the PR modifies or adds images, use the run-tests.sh imagedir command to verify the image works
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[carminevassallo]

Hi @candrews,

as mentioned in the other PR, thanks again for your contribution! We integrate your suggested label! We'll investigate which of the other annotations available here should be added to our images in the context of this task DOCKER-164.