haskellPackages.tmp-postgres: fix test suite

Was failing before when trying to create files in `$HOME` and marked as
broken subsequently.

pkgs/development/haskell-modules/configuration-common.nix

@@ -787,6 +787,9 @@ self: super: {
 
   # Needs pginit to function and pgrep to verify.
   tmp-postgres = overrideCabal super.tmp-postgres (drv: {
+    preCheck = ''
+      export HOME="$TMPDIR"
+    '' + (drv.preCheck or "");
     libraryToolDepends = drv.libraryToolDepends or [] ++ [pkgs.postgresql];
     testToolDepends = drv.testToolDepends or [] ++ [pkgs.procps];
   });

pkgs/development/haskell-modules/configuration-hackage2nix/broken.yaml

@@ -4755,7 +4755,6 @@ broken-packages:
   - Titim
   - tkhs
   - tkyprof
-  - tmp-postgres
   - todo
   - tofromxml
   - to-haskell

pkgs/development/haskell-modules/hackage-packages.nix

@@ -262697,8 +262697,6 @@ self: {
        ];
        description = "Start and stop a temporary postgres";
        license = lib.licenses.bsd3;
-       hydraPlatforms = lib.platforms.none;
-       broken = true;
      }) {};
 
   "tmpl" = callPackage