Dockerfile: Use COPY instead of ADD for copying the manifests directory

[timflannagan]

Fails the prodsec static tooling analysis.

[exdx]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: exdx, timflannagan

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[timflannagan]

This is a no-op while we continue to bootstrap the repository. Manually adding the required labels.

/override ci/prow/e2e
/label px-approved
/label docs-approved
/label qe-approved

[openshift-ci]

@timflannagan: Overrode contexts on behalf of timflannagan: ci/prow/e2e

In response to this:

This is a no-op while we continue to bootstrap the repository. Manually adding the required labels.

/override ci/prow/e2e
/label px-approved
/label docs-approved
/label qe-approved

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[openshift-ci]

@timflannagan: all tests passed!

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