fix: added prefix validation

[kierramarie]

Description

Added validation to check for proper prefix. The COS module has limit on the prefix, so each module that uses the COS module needs to adapt to this limit.

Git Issue: terraform-ibm-modules/terraform-ibm-cos#770

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[kierramarie]

/run pipeline

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[kierramarie]

/run pipeline

[kierramarie]

/run pipeline

[kierramarie]

/run pipeline

[kierramarie]

/run pipeline

[Ak-sky]

/run pipeline

[Ak-sky]

@kierramarie, can you please link the related github issue in the PR template and other missing info.

[Ak-sky]

CRA scan failed with below error

Plan: 1 to add, 0 to change, 0 to destroy.
╷
│ Error: Invalid function argument
│ 
│   on variables.tf line 53, in variable "prefix":
│   53:         length(regexall("^.*--.*", var.prefix)) == 0
│     ├────────────────
│     │ while calling regexall(pattern, string)
│     │ var.prefix is null
│ 
│ Invalid value for "string" parameter: argument must not be null.
╵

Error: Process completed with exit code 1.

[kierramarie]

/run pipeline

[kierramarie]

/run pipeline