shell-nix: also fetch cardano-wallet with more comments (#255)

shell.nix

@@ -6,14 +6,24 @@ let
   inherit (packages) pkgs plutus-apps plutus-playground pab-nami-demo docs webCommon;
   inherit (pkgs) stdenv lib utillinux python3 nixpkgs-fmt;
   inherit (plutus-apps) haskell stylish-haskell sphinxcontrib-haddock sphinx-markdown-tables sphinxemoji nix-pre-commit-hooks;
-  inherit (haskell.project.hsPkgs.cardano-wallet.components.exes) cardano-wallet;
 
-  # A standard release to feed cardano-cli & cardano-node to our shell
+  # Feed cardano-wallet, cardano-cli & cardano-node to our shell.
+  # This is stable as it doesn't mix dependencies with this code-base;
+  # the fetched binaries are the "standard" builds that people test.
+  # This should be fast as it mostly fetches Hydra caches without building much.
+  cardano-wallet = import
+    (pkgs.fetchgit {
+      url = "https://github.com/input-output-hk/cardano-wallet";
+      rev = "2fdc9a5aa44d8bc8bed0da74151ea1016fc30508";
+      sha256 = "09zz1488as64l8w6kk1ijhs4y4rsi47ashsb3gbikq3fn22mc8xb";
+    })
+    { };
   cardano-node = import
     (pkgs.fetchgit {
       url = "https://github.com/input-output-hk/cardano-node";
-      rev = "1.32.1";
-      sha256 = "00k9fqrm0gphjji23x0nc9z6bqh8bqrncgivn3mi3csacjzicrrx";
+      # A standard release compatible with the cardano-wallet commit above is always preferred.
+      rev = "1.33.0";
+      sha256 = "1hr00wqzmcyc3x0kp2hyw78rfmimf6z4zd4vv85b9zv3nqbjgrik";
     })
     { };
 
@@ -86,7 +96,7 @@ let
     cabal-install
     cardano-node.cardano-cli
     cardano-node.cardano-node
-    cardano-wallet
+    cardano-wallet.cardano-wallet
     cardano-repo-tool
     fixPngOptimization
     fixPurty