prisma-engines: add setup hook for configuring environment variables

The primary use case of this package is to use it in a devShell to allow
Prisma to work on NixOS. This setup hook simplifies this, by setting the
environment variables automatically.

Signed-off-by: Sefa Eyeoglu <contact@scrumplex.net>

pkgs/by-name/pr/prisma-engines/package.nix

@@ -63,6 +63,8 @@ rustPlatform.buildRustPackage rec {
   # Tests are long to compile
   doCheck = false;
 
+  setupHook = ./setup-hook.sh;
+
   meta = with lib; {
     description = "Collection of engines that power the core stack for Prisma";
     homepage = "https://www.prisma.io/";

pkgs/by-name/pr/prisma-engines/setup-hook.sh

@@ -0,0 +1,4 @@
+export PRISMA_SCHEMA_ENGINE_BINARY="@out@/bin/schema-engine"
+export PRISMA_QUERY_ENGINE_BINARY="@out@/bin/query-engine"
+export PRISMA_QUERY_ENGINE_LIBRARY="@out@/lib/libquery_engine.node"
+export PRISMA_FMT_BINARY="@out@/bin/prisma-fmt"