chore: Fix warnings during image build.

[alanconway]

Description

Fixed 2 issues, due to files not copied to image build:

• added '2> /dev/null' to silence git command used to get current branch.build.
• make targets using olm_deploy/ conditional on existence of directory.

/cc @xperimental
/assign @jcantrill

[openshift-ci]

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[jcantrill]

/hold

[alanconway]

Simplified and minimized the change - restored meaning of CURRENT_BRANCH. @xperimental @vparfonov I think this resolves your issues. @xperimental I left the .target stuff alone since it's not necessary to change it for this fix, but your comment is not wrong.

[openshift-ci]

@alanconway: all tests passed!

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[jcantrill]

/hold cancel

[jcantrill]

/lgtm