Nix: Get the Nix shell working on macOS/aarch64.

Improvements to the Nix configuration so that macOS is supported.

Microsoft SQL Server is still not supported (yet; I have something in mind there), but the rest works. You can still use Homebrew to install the SQL Server drivers.

I had to make the following changes:

* I updated nixpkgs, because it's been a while.

* I made `ODBCINSTINI` optional so that it's not loaded on macOS, as it depends on `msodbcsql17`, which is broken on macOS.

* I upgraded OpenSSL.

* I set `DYLD_LIBRARY_PATH` on macOS so GHC finds OpenSSL; otherwise, it uses the wrong version of `libcrypto`, and fails with a fun error:

  > WARNING: ghc is loading libcrypto in an unsafe way

* I patched GHC to fix compilation on macOS (copied from NixOS/nixpkgs#149942).

To test this out, you can run `nix develop` (or install [direnv][] and add `use flake` to _.envrc.local_), and then try building HGE in the shell provided.

Fair warning: GHC needs to be built, and takes _aaages_ the first time. If this becomes useful to others, we can set up a shared cache.

[direnv]: https://direnv.net/

PR-URL: hasura/graphql-engine-mono#5989
GitOrigin-RevId: 7130738d47709c37778b31c134061758ce23e959

.envrc.local.example

@@ -1,13 +1,13 @@
 #!/usr/bin/env bash
 
-# This is an example .envrc.local file you can start with. Uncomment the parts
-# you'd like to use, and copy this to `.envrc.local`
+### This is an example .envrc.local file you can start with. Uncomment the parts
+### you'd like to use, and copy this to `.envrc.local`.
 
-# Enable providing tooling with the Nix package manager
+### Enable providing tooling with the Nix package manager:
 # use flake
 
-# Enable providing NodeJS versions with `nvm`
+### Enable providing NodeJS versions with `nvm`:
 # use nvm
 
-# Enable providing GHC versions with `ghcup`
+### Enable providing GHC versions with `ghcup`:
 # use ghcup

scripts/make/ghcid.mk

@@ -10,7 +10,7 @@ PANE_HEIGHT = $(shell tmux display -p "\#{pane_height}" || echo 30 )
 # this needs to make it into ghcid: https://github.com/biegunka/terminal-size/pull/16
 define run_ghcid_hspec_tests
 	@if [[ $$(uname -p) == 'arm' ]]; then \
-		HSPEC_MATCH="$(2)" ghcid -c "cabal repl $(1) $(GHCID_TESTS_FLAGS)" \
+		HSPEC_MATCH="$(2)" ghcid -c "DYLD_LIBRARY_PATH=$$DYLD_LIBRARY_PATH cabal repl $(1) $(GHCID_TESTS_FLAGS)" \
 			--test "main" \
 			--width=$(PANE_WIDTH) \
 			--height=$(PANE_HEIGHT); \
@@ -22,7 +22,7 @@ endef
 
 define run_ghcid_main_tests
 	@if [[ $$(uname -p) == 'arm' ]]; then \
-		HSPEC_MATCH="$(3)" ghcid -c "cabal repl $(1) $(GHCID_TESTS_FLAGS)" \
+		HSPEC_MATCH="$(3)" ghcid -c "DYLD_LIBRARY_PATH=$$DYLD_LIBRARY_PATH cabal repl $(1) $(GHCID_TESTS_FLAGS)" \
 			--test "main" \
 			--setup ":set args $(2)" \
 			--width=$(PANE_WIDTH) \
@@ -103,5 +103,3 @@ ghcid-library-pro:
 ## ghcid-test-unit: build and run unit tests in ghcid
 ghcid-test-unit: remove-tix-file
 	$(call run_ghcid_main_tests,graphql-engine:graphql-engine-tests,unit)
-
-