facade for regular used Go Environment Variable calls
extracted from an older pandora box of such packages at abhishekkr/gol
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OverrideIfEnv(envVar string, defaultValue string) string -
OverrideIfEnvBool(envVar string, defaultValue bool) bool -
OverrideIfEnvInt(envVar string, defaultValue int) int -
OverrideIfEnvUint64(envVar string, defaultValue uint64) uint64 -
HasEnv(envVar string) bool -
EnvMap() map[string]string