Update Dockerfile.konflux.cpu to enable subscription manager

[MohammadiIram]

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[jiridanek]

/build-konflux

[jiridanek]

approving because I was told to do so

• https://redhat-internal.slack.com/archives/C07SBP17R7Z/p1762929755082029?thread_ts=1761667034.429529&cid=C07SBP17R7Z

[openshift-ci]

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[jiridanek]

pr build failed with

[2/2] STEP 3/9: RUN subscription-manager register --org "$(cat /activation-key/org)" --activationkey "$(cat /activation-key/activationkey)"
cat: /activation-key/org: No such file or directory
cat: /activation-key/activationkey: No such file or directory
Error: Must specify an activation key

[jiridanek]

and

Error: unable to copy from source docker://quay.io/aipcc/base-images/cpu:3.0-1761652019: choosing an image from manifest list docker://quay.io/aipcc/base-images/cpu:3.0-1761652019: no image found in image index for architecture "s390x", variant "", OS "linux"