Improve Trivy configuration

[macedogm]

Proposed Changes

1. Simplify Trivy install process in Dockerfile.dapper.
2. Improve Trivy output during the scan to make it more readable (using Go's Template).
   1. Current output:
      
   2. Improved output:

Target - Severity - ID - Package - Vulnerable Version - Fixed Version

bin/containerd - CRITICAL - CVE-2022-1996 - github.com/emicklei/go-restful - v2.9.5+incompatible - 2.16.0
bin/containerd - HIGH - CVE-2022-41721 - golang.org/x/net - v0.1.1-0.20221027164007-c63010009c80 - 0.1.1-0.20221104162952-702349b0e862
bin/containerd - HIGH - CVE-2022-41723 - golang.org/x/net - v0.1.1-0.20221027164007-c63010009c80 - 0.7.0
bin/runc - HIGH - CVE-2021-33194 - golang.org/x/net - v0.0.0-20201224014010-6772e930b67b - 0.0.0-20210520170846-37e1c6afe023
bin/runc - HIGH - CVE-2021-44716 - golang.org/x/net - v0.0.0-20201224014010-6772e930b67b - 0.0.0-20211209124913-491a49abca63
bin/runc - HIGH - CVE-2022-27664 - golang.org/x/net - v0.0.0-20201224014010-6772e930b67b - 0.0.0-20220906165146-f3363e06e74c
bin/runc - HIGH - CVE-2022-41723 - golang.org/x/net - v0.0.0-20201224014010-6772e930b67b - 0.7.0

Vulnerabilities - Critical: 1, High: 6

3. Add UpdateCLI automation to keep Trivy up to date. Example update PR https://github.com/macedogm/k3s/pull/11.

Types of Changes

Verification

Testing

Linked Issues

User-Facing Change

N/A

Further Comments

[macedogm]

CC @matttrach