Add flashblocks feature to ci (#595)

## 📝 Summary

We need flashblocks feature to build docker images

## 💡 Motivation and Context

<!--- (Optional) Why is this change required? What problem does it
solve? Remove this section if not applicable. -->

---

## ✅ I have completed the following steps:

* [ ] Run `make lint`
* [ ] Run `make test`
* [ ] Added tests (if applicable)

Author: SozinM

.github/workflows/release-op.yaml

@@ -27,6 +27,7 @@ on:
         options:
           - ''
           - 'redact-sensitive'
+          - 'flashblocks'
         required: false
         type: choice