refactor: added additional prefix validation

[kierramarie]

Description

Added validation to check for proper prefix.

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[kierramarie]

/run pipeline

.

[shemau]

Please consider the following changes, but don't feel obliged to adopt

Would it be neater

    condition = anytrue([
      var.prefix == null,
      can(regex("^([a-z]|[a-z][-a-z0-9]{0,14}[a-z0-9])$", var.prefix))
    ])

Either

null

the regex is
a single lower letter,
or,
a single lower letter, ending in letter or number with 0 to 14 characters (making 16 total) in the middle.

This avoids the coalesce commands with an arbitrary string and the need for a specific length validation

[kierramarie]

Closing because it doesn't use COS