How to instruct Phoenix to set secure flag (HTTPS only) on session cookie?

Questions & Help Questions
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9

What to when we want to put some session cookie based on env?
I am currently using this

@dev_env? Application.compile_env(:core, [:app_env], :prod) in ["dev", :dev]

  @session_options (case(!!@dev_env?) do
                      true ->
                        [
                          max_age: 120 * 60 * 60,
                          store: OPSWeb.Session.Store,
                          key: "_OPSWeb_",
                          signing_salt: "OPSWeb="
                        ]

                      false ->
                        [
                          max_age: 120 * 60 * 60,
                          store: OPSWeb.Session.Store,
                          key: "_OPSWeb_",
                          signing_salt: "OPSWeb=",
                          secure: true,
                          http_only: true
                        ]
                    end)

but when I want to get session options via function or compile env it fails
see issue