Add approval for release version (#6009)

* Build release images from Github action

* Modify release action to build based on input

* Add approval workflow

* Add Riku

Author: euanmillar

.github/workflows/publish-release.yml

@@ -23,6 +23,14 @@ jobs:
   base:
     runs-on: ubuntu-latest
     steps:
+      - uses: trstringer/manual-approval@v1
+        with:
+          secret: ${{ github.TOKEN }}
+          approvers: euanmillar,rikukissa
+          minimum-approvals: 1
+          issue-title: 'Release: ${{ github.event.inputs.release_version }}'
+          issue-body: 'Please approve or deny the publishing of release: ${{ github.event.inputs.release_version }} to Dockerhub'
+          exclude-workflow-initiator-as-approver: false
       - uses: actions/checkout@v2
         if: github.event_name == 'workflow_dispatch'
         with: