Include gosec in CI pipeline

[alegrey91]

Describe the feature

gosec is a Golang Security Checker. It inspects source code for security problems by scanning the Go AST.
I would include this in our pipeline.

What would the new user story look like?

A new user comes and wants to contribute to capsule.
He writes some Go code and pushes it to its branch.
At this time, the CI checks for the new code and detects if there are security issues.

Hopefully, the result should be like this:

...
[gosec] 2022/07/27 09:18:16 Checking package: service                                                                                                                                                                                         
[gosec] 2022/07/27 09:18:16 Checking file: capsule/pkg/webhook/service/errors.go                                                                                                                       
[gosec] 2022/07/27 09:18:16 Checking file: capsule/pkg/webhook/service/validating.go                                                                                                                   
[gosec] 2022/07/27 09:18:17 Checking package: utils                                                                                                                                                                                           
[gosec] 2022/07/27 09:18:17 Checking file: capsule/pkg/webhook/utils/error.go                                                                                                                          
[gosec] 2022/07/27 09:18:17 Checking file: capsule/pkg/webhook/utils/in_capsule_groups.go                                                                                                              
[gosec] 2022/07/27 09:18:17 Checking file: capsule/pkg/webhook/utils/is_capsule_user.go                                                                                                                
[gosec] 2022/07/27 09:18:17 Checking file: capsule/pkg/webhook/utils/is_tenant_owner.go                                                                                                                
[gosec] 2022/07/27 09:18:17 Checking file: capsule/pkg/webhook/utils/kubernetes_version.go                                                                                                             
Results:                                                                                                                                                                                                                                      
                                                                                                                                                                                                                                              
                                                                                                                                                                                                                                              
Summary:                                                                                                                                                                                                                                      
  Gosec  : 2.12.0                                                                                                                                                                                                                             
  Files  : 135                                                                                                                                                                                                                                
  Lines  : 9714                                                                                                                                                                                                                               
  Nosec  : 0                                                                                                                                                                                                                                  
  Issues : 0