ci: Update to horizon-spec 0.2.1

.gitlab-ci.dhall

@@ -3,29 +3,12 @@ let Prelude =
       ? https://raw.githubusercontent.com/dhall-lang/dhall-lang/v20.1.0/Prelude/package.dhall
           sha256:26b0ef498663d269e4dc6a82b0ee289ec565d683ef4c00d0ebdd25333a5a3c98
 
-let HsSrc =
-      < FromHackage : { name : Text, version : Text }
-      | FromGit :
-          { url : Text, revision : Optional Text, subdir : Optional Text }
-      >
-
-let Modifiers =
-      { Type = { doJailbreak : Bool, doCheck : Bool }
-      , default = { doJailbreak = True, doCheck = False }
-      }
-
-let Attr = λ(a : Type) → { mapKey : Text, mapValue : a }
-
-let HsPkg = {source : HsSrc, modifiers : Modifiers.Type }
-
-let Attr
-    : ∀(x : Type) → Type
-    = λ(x : Type) → { mapKey : Text, mapValue : x }
+let H = ./horizon-spec.dhall
 
 let Step = { script : List Text }
 
 let toStep
-    : ∀(id : Text) → ∀(prefix : Text) → ∀(x : Text) → Attr Step
+    : ∀(id : Text) → ∀(prefix : Text) → ∀(x : Text) → H.Attr Step
     = λ(id : Text) →
       λ(prefix : Text) →
       λ(x : Text) →
@@ -33,12 +16,12 @@ let toStep
         , mapValue.script = [ "nix build -L .#${prefix}.${x}" ]
         }
 
-let input = Prelude.Map.keys Text HsPkg ./manifest.dhall
+let input = Prelude.Map.keys Text H.HaskellPackage ./manifest.dhall
 
 let packages =
       Prelude.List.map
         (Text)
-        (Attr Step)
+        (H.Attr Step)
         ( λ(x : Text) →
             toStep "Package ${x}" "packages.x86_64-linux" x
         )