A board is just a visual level on top of you JIRA issues so you have to look at them:
Maybe you could create a custom field (flag) that only certain people can set (you could use a transition with the same target step for example) and put a condition on all the transitions leading to whatever statuses (steps) are mapped to your DONE column saying: "field must have value" (you get that with the following plugin https://marketplace.atlassian.com/plugins/com.innovalog.jmwe.jira-misc-workflow-extensions ). That way the transition is only displayed if the issue had been "approved" by someone...
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You might have noticed something new on Marketplace in the last several months which was the addition of our new collection pages. We heard feedback that it can be hard to browse apps in Marketplace ...
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