ImageName should be able to parse image names with IPv6 address literals

[rohanKanojia]

Task description

Description

Currently, ImageName only accepts domain names or IPv4 literals in the registry name.

However, parsing IPv6 literals support was added Docker Distrubution Reference.

We should modify our registry host regular expressions to accommodate IPv6 addresses.

Distribution's Regexp can be seen in regexp.go

domainName = domainNameComponent + anyTimes(`\.`+domainNameComponent)
ipv6address = `\[(?:[a-fA-F0-9:]+)\]`

host = `(?:` + domainName + `|` + ipv6address + `)`

Expected Behavior

ImageName should be able to parse image name with registry having IPv6 literal (e.g [2001:db8::1]:5000/repo:tag)

Acceptance Criteria

• ImageName validation logic is modified to handle IPv6 addresses