Update dockerfile to start supporting multi-arch builds

[AjayJagan]

Description

As a part of an effort to enable multi arch builds in konflux, we need to update the Dockerfile.

JIRA: https://issues.redhat.com/browse/RHOAIENG-28666

How Has This Been Tested?

Image built from konflux: quay.io/redhat-user-workloads/open-data-hub-tenant/codeflare-operator-multi-arch-poc:3adac4d93c0c4deedef5fdb484b6bdbccdfccb14

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

Summary by CodeRabbit

• Chores
  • Updated the Dockerfile to streamline the build process with a new base image and simplified build arguments, enhancing build efficiency without affecting application features or behavior.

[laurafitzgerald]

Hi @dgrove-oss we're fine with this change. if you are good i'm happy to lgtm it.

[dgrove-oss]

Hi @dgrove-oss we're fine with this change. if you are good i'm happy to lgtm it.

Looks fine to me. Thanks!

[AjayJagan]

@laurafitzgerald 👋 . Only the e2e fails , rest are okay

[AjayJagan]

@kryanbeane , every thing passed. Thanks 🙏

[AjayJagan]

Can someone help me merge this please :) @kryanbeane @laurafitzgerald

[laurafitzgerald]

/lgtm
/approve
after discussion with @dgrove-oss

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: laurafitzgerald

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