fix(#330): add ubi9/ubi-minimal to dependabot ignore list

[fullsend-ai-coder]

What type of PR is this?

cleanup

What this PR does / why we need it?

Adds ubi9/ubi-minimal to the Dependabot ignore list in .github/dependabot.yml.

The boilerplate update script (boilerplate/openshift/golang-osd-operator/update) manages the UBI base image tag via skopeo inspect during make generate. This makes Dependabot's Docker monitoring redundant for this image — every Dependabot PR that bumps ubi9/ubi-minimal fails ci/prow/validate because the boilerplate overwrites the proposed tag, dirtying the checkout. At least 9 consecutive PRs failed this way over 4 months (#252, #258, #262, #286, #300, #302, #305, #311, #314, #329).

This follows the existing pattern for app-sre/boilerplate and openshift4/ose-operator-registry, which are already ignored for the same reason (externally managed versions).

Which Jira/Github issue(s) this PR fixes?

Fixes #330

Special notes for your reviewer:

The UBI base image will continue to be updated through boilerplate syncs — no update coverage is lost.

Pre-checks (if applicable):

• Tested latest changes against a cluster
• Ran make generate command locally to validate code changes
• Included documentation changes with PR

---

Closes #330

Post-script verification

• Branch is not main/master (agent/330-ignore-ubi-minimal-dependabot)
• Secret scan passed (gitleaks — 02457724d74fd7bae321132065b88b0d51f04db9..HEAD)
• PR body secret scan passed (gitleaks — no-git)

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: fullsend-ai-coder[bot]
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[openshift-ci]

Hi @fullsend-ai-coder[bot]. Thanks for your PR.

I'm waiting for a openshift 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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