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]

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[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.

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[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

[svghadi]

Suggested change

	- linux/arm64
	- linux/ppc64le
	- linux/s390x

Let's run PR builds only on amd64. I noticed long delays in setting up build env for non amd archs.

[svghadi]

/lgtm