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Parallelism Flag Validation

docs/src/data/changelog/v1.0.7/parallelism-flag-validation.mdx

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the --parallelism flag no longer accepts non-positive numbers

Previously, terragrunt commands that accept the --parallelism flag (or equivalently the $TG_PARALLELISM environment variable) used to hang indefinitely when invoked with --parallelism=0.

Terragrunt now validates that the value is positive and exits with an error otherwise.

Reported in #6211