nix: Disable building profiled or dynamic libraries by default

We never need dynamic haskell libraries, because even the dynamic builds
only dynamically link non-haskell dependencies, but always link haskell
dependencies statically.

Profiled libraries are only required when running the memory test, so
explicitly enable them for the profiled package.

This also means, that we don't need to hide the memory test behind a
feature flag anymore. The reason always was assumed to be the big number
of rebuilds required for it. I assume ever since we moved off of
static-haskell-nix and back to nixpkgs-based builds, we have been
building profiled libraries for all our dependencies anway.

shell.nix

@@ -7,7 +7,6 @@
 # We highly recommend that use the PostgREST binary cache by installing cachix
 # (https://app.cachix.org/) and running `cachix use postgrest`.
 { docker ? false
-, memory ? false
 }:
 let
   postgrest =
@@ -23,14 +22,14 @@ let
       postgrest.devTools
       postgrest.docs
       postgrest.loadtest
+      postgrest.memory
       postgrest.nixpkgsTools
       postgrest.release
       postgrest.style
       postgrest.tests
       postgrest.withTools
     ]
-    ++ lib.optional docker postgrest.docker
-    ++ lib.optional memory postgrest.memory;
+    ++ lib.optional docker postgrest.docker;
 
 in
 lib.overrideDerivation postgrest.env (