github ok-to-test: add more info in comment (#456)

Author: jotak

.github/workflows/push_image_pr.yml

@@ -46,5 +46,14 @@ jobs:
               issue_number: context.issue.number,
               owner: context.repo.owner,
               repo: context.repo.repo,
-              body: 'New image: ${{ env.WF_REGISTRY }}/${{ env.WF_IMAGE }}:${{ env.short_sha }}. It will expire after two weeks.'
+              body: `New image:
+            ${{ env.WF_REGISTRY }}/${{ env.WF_IMAGE }}:${{ env.short_sha }}
+
+            It will expire after two weeks.
+
+            To deploy this build, run from the operator repo, assuming the operator is running:
+            \`\`\`bash
+            USER=netobserv VERSION=${{ env.short_sha }} make set-flp-image
+            \`\`\`
+            `
             })