1. Add push helm chart oci test in nightly; 2. Modify archive icon locator xpath; Signed-off-by: danfengliu <danfengl@vmware.com>
1. Add notary tool in E2E Dockerfile; 2. Add push docker manifest list test in nightly; 3. Modify document for e2e user guide; 4. Add CNAB tool in E2E Dockerfile; Signed-off-by: danfengliu <danfengl@vmware.com>
1. Modify get signature API in sign image test; 2. Modify locator for tag in artifact list; Signed-off-by: danfengliu <danfengl@vmware.com>