Add dhall definitions for linked service dependencies

dhall/Config.dhall

@@ -1,5 +1,7 @@
 let Addon = (./Addon.dhall).Type
 
+let ServiceDependency = (./ServiceDependency.dhall).Type
+
 let Vault = ./Vault.dhall
 
 let FixedOrRange =
@@ -28,6 +30,7 @@ let Config =
         , clever_haskell_entry_point : Optional Text
         , clever_disable_metrics : Bool
         , clever_addons : List Addon
+        , clever_service_dependencies : List ServiceDependency
         , clever_env : Environment
         , clever_build_flavor : Optional Text
         , clever_scaling : Optional ScalingParameters
@@ -48,6 +51,7 @@ let mkConfig =
           , clever_haskell_entry_point = None Text
           , clever_disable_metrics = False
           , clever_addons = [] : List Addon
+          , clever_service_dependencies = [] : List ServiceDependency
           , clever_env = {=}
           , clever_build_flavor = None Text
           , clever_scaling = None ScalingParameters

dhall/ServiceDependency.dhall

@@ -0,0 +1,9 @@
+let ServiceDependency =
+      < Addon : { addon_id : Text } | Application : { app_id : Text } >
+
+let addon = λ(addon_id : Text) → ServiceDependency.Addon { addon_id = addon_id }
+
+let application =
+      λ(app_id : Text) → ServiceDependency.Application { app_id = app_id }
+
+in  { Type = ServiceDependency, addon = addon, application = application }

dhall/package.dhall

@@ -1 +1,5 @@
-{ Addon = ./Addon.dhall, Config = ./Config.dhall, Vault = ./Vault.dhall }
+{ Addon = ./Addon.dhall
+, ServiceDependency = ./ServiceDependency.dhall
+, Config = ./Config.dhall
+, Vault = ./Vault.dhall
+}