Implement CI-only nix shell without hoogle

shell.nix

@@ -21,6 +21,15 @@
   })
 }:
 let
+  packages = ps: with ps; [
+    hydra-prelude
+    hydra-node
+    hydra-plutus
+    hydra-cluster
+    merkle-patricia-tree
+    plutus-cbor
+  ];
+
   libs = [
     libsodium-vrf
     pkgs.systemd
@@ -45,13 +54,7 @@ let
   ];
 
   haskellNixShell = hsPkgs.shellFor {
-    packages = ps: with ps; [
-      hydra-prelude
-      hydra-node
-      hydra-plutus
-      hydra-cluster
-      merkle-patricia-tree
-    ];
+    packages = packages;
 
     # Haskell.nix managed tools (via hackage)
     tools = {
@@ -92,8 +95,29 @@ let
     STACK_IN_NIX_SHELL = "true";
   };
 
+  # A shell disabling hoogle, for use in CI
+  # FIXME: I did not manage to reuse haskellNixShell and simply change `withHoogle` value
+  # so copy/pasted everything else
+  ciShell = hsPkgs.shellFor {
+    packages = packages;
+
+    # Haskell.nix managed tools (via hackage)
+    tools = {
+      cabal = "3.4.0.0";
+      fourmolu = "latest";
+      haskell-language-server = "latest";
+    };
+
+    buildInputs = libs ++ tools;
+
+    withHoogle = false;
+
+    # Always create missing golden files
+    CREATE_MISSING_GOLDEN = 1;
+  };
+
 in
 haskellNixShell // {
   cabalOnly = cabalShell;
-  ci = haskellNixShell { withHoogle = false; };
+  ci = ciShell;
 }