Allow color.NoColor = false to set via cli

[amandel]

Reading https://github.com/fatih/color#github-actions it is possible to get colorful output also in ci environments by setting color.NoColor = false it would be nice if this can be set or forced via trivy cli option (like --no-colour=false) for the table output.

[stefanlasiewski]

Also see this related issue (Autoclosed):

#1091

[amandel]

Bringing #1091 and this one together as feature request:

The used color package does a good job in auto detecting whether the output supports ANSI coloring or not. Unfortunately for some use cases (mostly CI or other automation) this fails and needs manual override. Fortunately the color package already has this needed functionality as described in the color readme section for github-actions

For the table format of trivy, it would be nice to have a trivy cli option --color with possible values true, false, and default auto. The default is current behavior, true or false set color.NoColor to the respective value.

[stefanlasiewski]

This would be very useful for simple use cases like a simple shell script that calls trivy image ubuntu:20.04 | grep CVE.

--format json is more complicated then what many folks need, and --format template even more so.

[github-actions]

This issue is stale because it has been labeled with inactivity.