1. Update ubuntu version to 20.04
2. Update containerd version to 1.6.9
3. Update docker-compose version to 2.12.2
4. Update helm version to 3.10.1
5. Update ORAS version to 0.16.0
6. Update CNAB version to 0.3.7
7. Update imgpkg version to 0.33.0
8. Update cosign version to 1.13.1
9. Remove singularity
Signed-off-by: Yang Jiao <jiaoya@vmware.com>
Build base image step should be in build package workflow, and local base images build by new step should be removed since images have been pushed to docker hub.
Signed-off-by: danfengliu <danfengl@vmware.com>
