env format seems to work wrong

[jeusdi]

I'm trying to format my secrets to environment variables:

spec:
  containers:
  - image: quay.io/ukhomeofficedigital/vault-sidekick:latest
    name: sidekick
    args:
    - -cn=secret:openshift/postgresql:env=USERNAME

This is the output:

I0620 13:43:38.834735       1 main.go:45] starting the vault-sidekick, v0.3.8 (git+sha 72ffdbf)
W0620 13:43:38.834813       1 vault.go:545] skipping TLS verification is not recommended
I0620 13:43:38.835138       1 vault.go:289] rescheduling the resource: type: secret, path: openshift/postgresql, channel: 0xc420058180
I0620 13:43:38.844698       1 vault.go:437] retrieved resource: type: secret, path: openshift/postgresql, leaseId: , lease_time: 168h0m0s
I0620 13:43:38.844927       1 formats.go:165] saving the file: /etc/secrets/postgresql.secret
I0620 13:43:38.845096       1 watched_resource.go:67] setting a renewal notification on resource: type: secret, path: openshift/postgresql, time: 146h12m4s

However, once in terminal:

$ env | grep USERNAME
$

The result is empty.

Any ideas?