Avoid redundant frontend builds

[jotak]

The goal is to avoid redundant frontend builds for each architecture, since the frontend artifacts are just plain text files / noarch.

For now it's only for upstream builds, but the goal would be to have the same with konflux

[openshift-ci]

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[openshift-ci]

@jotak: The following tests 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/plugin-cypress	f8d4713	link	true	/test plugin-cypress
ci/prow/qe-e2e-console-tests	f8d4713	link	false	/test qe-e2e-console-tests
ci/prow/images	f8d4713	link	true	/test images

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[jpinsonneau]

Approach looks good 👌

Just some thoughts here:

• We may want to merge with Dockerfile.cypress and Dockerfile.downstream too
• We could also have a Dockerfile.back for consistency

[jotak]

@jpinsonneau I agree there's more to do

• downstream => we need to update the konflux pipeline accordingly
• cypress => we need to update prow... anyway prow needs an update in any case I think

[jotak]

Talked with Mehul, I'll merge it as it is and then fix what's broken in prow