enable custom env var passthrough & document usage #197
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fixes #196, at least partially
I'm not sure if the helm chart will need to get changed to allow using these or if this is already possible via:
https://github.com/PrivateBin/helm-chart/blob/8c5baa8f9be31a6a53b70731159ad378d09b93da/charts/privatebin/values.yaml#L114-L116
Note that this only affects the php-fpm-based images. The nginx unit images don't filter the environment, so could already use this technique.