fix: handle flake check user in darwin env

Author: samrose

nix/checks.nix

@@ -171,9 +171,29 @@
                 #First we need to create a generic pg cluster for pgtap tests and run those
                 export GRN_PLUGINS_DIR=${pkgs.supabase-groonga}/lib/groonga/plugins
                 PGTAP_CLUSTER=$(mktemp -d)
+                # Set USER environment variable to handle root user restriction on macOS
+                # This is a common pattern in Nix builds to handle user-related issues
+                export USER="$(whoami)"
+                if [[ "$(uname)" == "Darwin" ]]; then
+                  # On macOS, ensure we're not running as root for initdb
+                  if [[ "$USER" == "root" ]]; then
+                    export USER="nobody"
+                  fi
+                fi
 
-                # Use --allow-group-access to allow initdb to run as root (needed on macOS)
-                initdb --locale=C --username=supabase_admin --allow-group-access -D "$PGTAP_CLUSTER"
+                # Initialize database with proper flags based on version
+                if [ "${majorVersion}" = "orioledb-17" ]; then
+                  initdb -D "$PGTAP_CLUSTER" \
+                    --allow-group-access \
+                    --username=supabase_admin \
+                    --locale-provider=icu \
+                    --encoding=UTF-8 \
+                    --icu-locale=en_US.UTF-8
+                else
+                  initdb -D "$PGTAP_CLUSTER" \
+                    --allow-group-access \
+                    --username=supabase_admin
+                fi
                 substitute ${./tests/postgresql.conf.in} "$PGTAP_CLUSTER"/postgresql.conf \
                   --subst-var-by PGSODIUM_GETKEY_SCRIPT "${getkey-script}/bin/pgsodium-getkey"
                 echo "listen_addresses = '*'" >> "$PGTAP_CLUSTER"/postgresql.conf