Use Go 1.20...

[slintes]

... and prepare to define builder image in this repo instead of Openshift CI's repo for easier updates

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: slintes

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• OWNERS [slintes]

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[slintes]

/retest

[clobrano]

/lgtm

Giving a chance to get more feedbacks, feel free to unhold
/hold

[slintes]

will merge in order to unblock other PRs, this will be tested on their jobs then

/override ci/prow/4.11-openshift-e2e
/override ci/prow/4.12-openshift-e2e
/override ci/prow/4.13-openshift-e2e

/hold cancel

[openshift-ci]

@slintes: Overrode contexts on behalf of slintes: ci/prow/4.11-openshift-e2e, ci/prow/4.12-openshift-e2e, ci/prow/4.13-openshift-e2e

In response to this:

will merge in order to unblock other PRs, this will be tested on their jobs then

/override ci/prow/4.11-openshift-e2e
/override ci/prow/4.12-openshift-e2e
/override ci/prow/4.13-openshift-e2e

/hold cancel

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