chore: split BindFlags into BindFlags + ParseFlags to remove side effect

[PhantomInTheWire]

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📥 Commits

Reviewing files that changed from the base of the PR and between a720fd7 and 8f1c18a.

📒 Files selected for processing (3)

• cmd/picodns/main.go
• internal/config/config.go
• internal/config/config_test.go

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• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/config-bindflag

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