Unable to enable JKS export from env vars

There appears to be a typo in the struct definition: https://gitlab.com/msvechla/vaultbot/blob/master/cli/options.go#L50

The code references end: rather than env:.

JKSExport       bool    `long:"pki_jks_export" end:"PKI_JKS_EXPORT" description:"If set, certificate export will be done to a JAVA KeyStore instead of the regular PEM files. Takes precedence over CertPath, CAChainPath, PrivKeyPath, and PEMBundlePath"`

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