Feature request: split envs for nextjs chart into secret and non-secret ones

[gecube]

Now all envs are passed like extraEnvs:

helm/charts/nextjs/values.yaml

Line 132 in 5e8747d

extraEnvs: []

It would be more convenient if we would have two lists:

• extraEnvs which would convert to ConfigMap
• and extraSecretEnvs which would convert to Secret

in such a way it would be easy to use the chart with sops and FluxCD tooling and cypher only "secret" part of environment variables.

[gecube]

tried to solve with #20