NO-JIRA: chore(Dockerfiles): sync odh-io changes to Dockerfile.konflux.* files in rhds

[jiridanek]

Fixes https://github.com/red-hat-data-services/notebooks/actions/runs/18775959534/job/53570521889

Description

• RHAIENG-495: fix(Dockerfile.cpu): add gettext for required envsubst usage in run-nginx.sh opendatahub-io/notebooks#2612

How Has This Been Tested?

Self checklist (all need to be checked):

• Ensure that you have run make test (gmake on macOS) before asking for review
• Changes to everything except Dockerfile.konflux files should be done in odh/notebooks and automatically synced to rhds/notebooks. For Konflux-specific changes, modify Dockerfile.konflux files directly in rhds/notebooks as these require special attention in the downstream repository and flow to the upcoming RHOAI release.

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]

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[jiridanek]

/build-konflux

[openshift-ci]

@jiridanek: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/images	4448f11	link	true	/test images

Full PR test history. Your PR dashboard.

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