Description

Ubuntu finished base support for ubuntu 20.04.
But Ubuntu still support 20.04 for Ubuntu Pro (ESM).

Required changes:

• Add advisories for 20.04-ESM in Trivy-db (feat(ubuntu): add support 20.04-ESM trivy-db#540)
• Add 20.04-ESM into EOL dates in Trivy (feat(ubuntu): add eol date for 20.04-ESM #8981)

Discussed in #8977