nix: add postgrest-with-postgresql-17

PostgreSQL 17 has been released:
https://www.postgresql.org/about/news/postgresql-17-released-2936/

Let's make sure CI runs with it, too.

nix/README.md

@@ -80,7 +80,7 @@ postgrest-lint                    postgrest-with-postgresql-13
 postgrest-run                     postgrest-with-postgresql-14
 postgrest-style                   postgrest-with-postgresql-15
 postgrest-style-check             postgrest-with-postgresql-16
-postgrest-test-io
+postgrest-test-io                 postgrest-with-postgresql-17
 ...
 
 [nix-shell]$
@@ -104,7 +104,7 @@ postgrest-lint                    postgrest-with-postgresql-13
 postgrest-run                     postgrest-with-postgresql-14
 postgrest-style                   postgrest-with-postgresql-15
 postgrest-style-check             postgrest-with-postgresql-16
-postgrest-test-io
+postgrest-test-io                 postgrest-with-postgresql-17
 postgrest-test-memory
 ...
 

nix/overlays/default.nix

@@ -4,6 +4,5 @@
   gitignore = import ./gitignore.nix;
   haskell-packages = import ./haskell-packages.nix;
   postgresql-libpq = import ./postgresql-libpq.nix;
-  postgresql-future = import ./postgresql-future.nix;
   slocat = import ./slocat.nix;
 }

nix/overlays/postgresql-future.nix

@@ -1,19 +0,0 @@
-_: _:
-# Overlay that adds future versions of PostgreSQL that are supported by
-# PostgREST.
-{
-  ## Example for including a postgresql version from a specific nixpks commit:
-  ##
-  #  postgresql_16 =
-  #    let
-  #      rev = "5148520bfab61f99fd25fb9ff7bfbb50dad3c9db";
-  #      tarballHash = "1dfjmz65h8z4lk845724vypzmf3dbgsdndjpj8ydlhx6c7rpcq3p";
-  #
-  #      pinnedPkgs =
-  #        builtins.fetchTarball {
-  #          url = "https://github.com/nixos/nixpkgs/archive/${rev}.tar.gz";
-  #          sha256 = tarballHash;
-  #        };
-  #    in
-  #    (import pinnedPkgs { }).pkgs.postgresql_16;
-}