zig: move ZIG_GLOBAL_CACHE_DIR setup to configurePhase

This allows users to put zig in their `mkShell` without ending up with a
ZIG_GLOBAL_CACHE_DIR value set that points back to a location that only
would exist in the sandbox.

doc/hooks/zig.section.md

@@ -32,6 +32,10 @@ stdenv.mkDerivation {
 
 The variables below are exclusive to `zig`.
 
+#### `dontUseZigConfigure` {#dont-use-zig-configure}
+
+Disables using `zigConfigurePhase`.
+
 #### `dontUseZigBuild` {#dont-use-zig-build}
 
 Disables using `zigBuildPhase`.

doc/redirects.json

@@ -2762,6 +2762,9 @@
     "index.html#zig-exclusive-variables",
     "index.html#zig-hook-exclusive-variables"
   ],
+  "dont-use-zig-configure": [
+    "index.html#dont-use-zig-configure"
+  ],
   "dont-use-zig-build": [
     "index.html#dont-use-zig-build"
   ],

pkgs/development/compilers/zig/setup-hook.sh

@@ -4,9 +4,13 @@
 readonly zigDefaultCpuFlag=@zig_default_cpu_flag@
 readonly zigDefaultOptimizeFlag=@zig_default_optimize_flag@
 
-function zigSetGlobalCacheDir {
+function zigConfigurePhase {
+  runHook preConfigure
+
   ZIG_GLOBAL_CACHE_DIR=$(mktemp -d)
   export ZIG_GLOBAL_CACHE_DIR
+
+  runHook postConfigure
 }
 
 function zigBuildPhase {
@@ -97,8 +101,9 @@ function zigInstallPhase {
   runHook postInstall
 }
 
-# shellcheck disable=SC2154
+if [ -z "${dontUseZigConfigure-}" ] && [ -z "${configurePhase-}" ]; then
-addEnvHooks "$hostOffset" zigSetGlobalCacheDir
+  configurePhase=zigConfigurePhase
+fi
 
 if [ -z "${dontUseZigBuild-}" ] && [ -z "${buildPhase-}" ]; then
   buildPhase=zigBuildPhase