ISSUE #631: lowercase the image repository name in github actions

[RomanFilip]

Fixes #631

Description

Error: unable to parse value provided [ghcr.io/RomanFilip/notebooks-fork/workbench-images/build-cache] to --cache-to: invalid repo "ghcr.io/RomanFilip/notebooks-fork/workbench-images/build-cache": must contain registry and repository: invalid reference format: repository name must be lowercase

https://github.com/RomanFilip/notebooks-fork/actions/runs/13499383840/job/37713825404#step:17:95

How Has This Been Tested?

• https://github.com/RomanFilip/notebooks-fork/actions/runs/13502100423

Merge criteria:

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[openshift-ci]

Hi @RomanFilip. Thanks for your PR.

I'm waiting for a opendatahub-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[jiridanek]

https://cbea.ms/git-commit/#imperative

A properly formed Git commit subject line should always be able to complete the following sentence:

If applied, this commit will

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[jiridanek]

/override ci/prow/images
not applicable

/lgtm
/approve

[openshift-ci]

@jiridanek: Overrode contexts on behalf of jiridanek: ci/prow/images

In response to this:

/override ci/prow/images
not applicable

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[jstourac]

Next time, it would be nice to use some POSIX way, see e.g.: https://stackoverflow.com/questions/2264428/how-to-convert-a-string-to-lower-case-in-bash . But yeah... no need to update this since it's been merged already and works just fine.