Update tekton configuration and add a new dockerfile for downstream build

[Mangaal]

What type of PR is this?

Update tekton configuration and add a new dockerfile for downstream build

/kind enhancement

What does this PR do / why we need it:

Have you updated the necessary documentation?

• Documentation update is required by this PR.
• Documentation has been updated.

Which issue(s) this PR fixes:

Fixes #?

How to test changes / Special notes to the reviewer:

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign chetan-rns for approval. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[openshift-ci]

Hi @Mangaal. Thanks for your PR.

I'm waiting for a redhat-developer 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.

I understand the commands that are listed here.

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.

[svghadi]

/ok-to-test

[svghadi]

I think we need to find replacements for CI_* env vars. If I am not wrong, these vars are CPAAS specific. We need to figure out konflux equivalent for these or manually define them.

[Mangaal]

Thanks @svghadi , you are right, I will try to find konflux equivalent for these

[svghadi]

Even I need them for dex builds. Let me know if you find them.

[svghadi]

We can address this during release pipeline configurations, shouldn't be a blocker for merging this PR.

[svghadi]

@Mangaal - Can you enable multi-platform builds? You need to update build-platforms parma in tekton configs.

  - name: build-platforms
    value:
    - linux/x86_64
    - linux/arm64
    - linux/ppc64le
    - linux/s390x

[svghadi]

Also enable hermetic builds

• https://konflux-ci.dev/docs/how-tos/configuring/hermetic-builds/
• https://konflux-ci.dev/docs/how-tos/configuring/prefetching-dependencies/#gomod