Merge pull request juspay#3 from arjunkathuria/GHC-927

GHC 927 upgrade

.envrc

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+use flake

cabal.project

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+packages:
+  .
+

flake.nix

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+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    haskell-flake.url = "github:srid/haskell-flake";
+
+    ## Use Juspay upstream after PR merged - https://github.com/juspay/beam-mysql/pull/40
+    beam-mysql.url = "github:arjunkathuria/beam-mysql/GHC-927";
+    beam-mysql.inputs.nixpkgs.follows = "nixpkgs";
+    beam-mysql.inputs.haskell-flake.follows = "haskell-flake";
+  };
+
+  outputs = inputs@{ self, nixpkgs, flake-parts, ... }:
+    flake-parts.lib.mkFlake { inherit inputs; } ({ withSystem, ... }: {
+      systems = nixpkgs.lib.systems.flakeExposed;
+      imports = [
+        inputs.haskell-flake.flakeModule
+      ];
+      perSystem = { self', pkgs, lib, config, ... }: {
+        haskellProjects.default = {
+          projectFlakeName = "sequelize";
+          basePackages = pkgs.haskell.packages.ghc927;
+          imports = [
+            inputs.beam-mysql.haskellFlakeProjectModules.output
+          ];
+          settings = {
+            beam-postgres.check = false;
+            beam-mysql.jailbreak = true;
+            generic-lens.check = false;
+          };
+          autoWire = [ "packages" "checks" "devShells" "apps"];
+        };
+      };
+    });
+}