Ensure container job uses a version digest

*Error: Container job uses a version digest
Bridgecrew Policy ID: BC_REPO_AZURE_PIPELINES_2
Checkov Check ID: CKV_AZUREPIPELINES_2
Severity: LOW

Ensure the containers used in your pipelines have a defined version or a digest.

-  container: ubuntu
+  container: ubuntu:jammy-20221101