Create rhv-build (#725)

* Create rhv-build

.github/workflows/rhv-build

@@ -0,0 +1,20 @@
+name: RHV build
+on:
+  push:
+    branches: [ovirt-engine-4.5.3.z]
+  workflow_dispatch:
+
+jobs:
+  get-pr:
+    runs-on: ubuntu-latest
+    outputs:
+      pr_url: ${{ steps[0].outputs.test }}
+    steps:
+    - run: curl -sS https://api.github.com/repos/oVirt/ovirt-engine/commits/${{github.event.push.head_commit.id}}/pulls | jq -r .[0].url
+
+  rhv-build-and-ost:
+    needs: get-pr
+    uses: oVirt/ovirt-system-tests/.github/workflows/ost.yaml@master
+    with:
+      comment: "/ost rhv-build rhel8"
+      pr_url: "${{ needs.get-pr.outputs.pr_url }}"