This commit fixes an issue within containerboot that arose from the
kubernetes operator. When users enable metrics on custom resources that
are running on dual stack or ipv6 only clusters, they end up with an error
as we pass the hostport combintation using $(POD_IP):PORT.
In go, `netip.ParseAddrPort` expects square brackets `[]` to wrap the host
portion of an ipv6 address and would naturally, crash.
When loading the containerboot configuration from the environment we now
check if the `TS_LOCAL_ADDR_PORT` value contains the pod's v6 ip address.
If it does & does not already contain brackets, we add the brackets in.
Closes: #15762Closes: #15467
Signed-off-by: David Bond <davidsbond93@gmail.com>
f2b4d7065d