ImageContentPolicy Schema does not allow many valid hostnames for mirrors or sources

[bdurrow]

My reading of the regex below is that all hostname components must start with an alpha. It seems like this was designed to prevent IP addresses. It seems that there are valid use cases to use IP addresses but the rfc1123 also allows for hostname components to start with a number.

api/config/v1/0000_10_config-operator_01_imagecontentpolicy.crd.yaml

Line 56 in 143629b

pattern: ^(([a-zA-Z]|[a-zA-Z][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z]|[A-Za-z][A-Za-z0-9\-]*[A-Za-z0-9])(:[0-9]+)?(\/[^\/:\n]+)*(\/[^\/:\n]+((:[^\/:\n]+)|(@[^\n]+)))?$

RFC1123 Section 2.1 Hostnames and Numbers specifically calls out:

The syntax of a legal Internet host name was specified in [RFC-952](https://datatracker.ietf.org/doc/html/rfc952)
      [DNS:4].  One aspect of host name syntax is hereby changed: the
      restriction on the first character is relaxed to allow either a
      letter or a digit.  Host software MUST support this more liberal
      syntax.

and later in the same section:

Whenever a user inputs the identity of an Internet host, it SHOULD
      be possible to enter either (1) a host domain name or (2) an IP
      address in dotted-decimal ("#.#.#.#") form.

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