Add container registry

[optik-aper]

Description

Add container registry

Checklist:

• [x] Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• [x] Have you linted your code locally prior to submission?
• [x] Have you successfully ran tests with your changes locally?

Testing instructions

• List plans

  go run main.go container-registry plans

• List regions

  go run main.go container-registry regions

• Create a registry

  go run main.go container-registry 

• List registries

  go run main.go container-registry list

• Update a registry

  go run main.go container-registry update <ID> --public="false" --plan="start_up"

• Get a registry

  go run main.go container-registry get <ID>

• You'll have to login to and create and image/repo to test the repository commands
  • docker login and docker push for an image
• List repositories on a registry

  go run main.go container-registry repository list <ID>

• Update a repository on a registry

  go run main.go container-registry repository update <ID> --image-name="<YOUR REPO>" --description="new description"

• Get a repository on a registry

  go run main.go container-registry repository get <ID> --image-name="<YOUR REPO>"

• Get docker credentials

  go run main.go container-registry credentials docker <ID>

• Delete a repository

  go run main.go container-registry repository delete <ID> --image-name="<YOUR REPO>"

• Delete a registry

  go run main.go container-registry delete <ID>

[github-actions[bot]]

Unit Tests and Coverage

Show Output

``` ? github.com/vultr/vultr-cli/v2 [no test files] ```

Pusher: @optik-aper, Action: pull_request_target

[github-actions[bot]]

Unit Tests and Coverage

Show Output

``` ? github.com/vultr/vultr-cli/v2 [no test files] ```

Pusher: @optik-aper, Action: pull_request_target

[github-actions[bot]]

Unit Tests and Coverage

Show Output

``` ? github.com/vultr/vultr-cli/v2 [no test files] ```

Pusher: @optik-aper, Action: pull_request_target

[github-actions[bot]]

Unit Tests and Coverage

Show Output

``` ? github.com/vultr/vultr-cli/v2 [no test files] ```

Pusher: @optik-aper, Action: pull_request_target

[github-actions[bot]]

Unit Tests and Coverage

Show Output

``` ? github.com/vultr/vultr-cli/v2 [no test files] ```

Pusher: @optik-aper, Action: pull_request_target

[github-actions[bot]]

Unit Tests and Coverage

Show Output

``` ? github.com/vultr/vultr-cli/v2 [no test files] ```

Pusher: @optik-aper, Action: pull_request_target