(fix): export the CERT_MGR_VERSION env var for releasing

[everettraven]

Description

• Update the Makefile to export the CERT_MGR_VERSION environment variable when releasing

Motivation

• fix the problem encountered when trying to cut the v0.1.0 release: https://github.com/operator-framework/catalogd/actions/runs/4757675157/jobs/8454773378#step:7:257

[everettraven]

/cherry-pick release-v0.1

[openshift-cherrypick-robot]

@everettraven: once the present PR merges, I will cherry-pick it on top of release-v0.1 in a new PR and assign it to you.

In response to this:

/cherry-pick release-v0.1

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[dtfranz]

Approved, but also wondering what the reason is for not exporting them in one place up above like we have here?

Edit: I don't have write access for approval 😢

[everettraven]

but also wondering what the reason is for not exporting them in one place up above like we have here?

No particular reason - I think we put them where they are since they are only used for the release process so at the time it made sense to keep them near the release target. We can move them in a follow-up if we want to be more consistent with what operator-controller is doing.

[openshift-cherrypick-robot]

@everettraven: new pull request created: #48

In response to this:

/cherry-pick release-v0.1

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/test-infra repository.