fix: wait for the macOS Nix daemon before evaluation

.github/workflows/nix-interop.yml

@@ -51,6 +51,30 @@ jobs:
             experimental-features = nix-command flakes
             accept-flake-config = false
 
+      - name: Wait for the Nix store to become ready
+        shell: bash
+        run: |
+          set -euo pipefail
+          if [[ "$RUNNER_OS" != "macOS" ]]; then
+            nix store ping
+            exit 0
+          fi
+
+          for attempt in $(seq 1 20); do
+            if NIX_REMOTE=daemon nix store ping >/dev/null 2>&1; then
+              printf 'NIX_REMOTE=daemon\n' >> "$GITHUB_ENV"
+              exit 0
+            fi
+            echo "Nix daemon is not ready yet (attempt ${attempt}/20)" >&2
+            sudo launchctl kickstart -k system/org.nixos.nix-daemon >/dev/null 2>&1 || true
+            sleep 2
+          done
+
+          sudo launchctl print system/org.nixos.nix-daemon || true
+          ls -la /nix/var/nix/daemon-socket || true
+          echo "Nix daemon did not become ready" >&2
+          exit 1
+
       - name: Load the locked Nixpkgs input
         shell: bash
         run: |
@@ -308,7 +332,7 @@ jobs:
               flags=re.MULTILINE,
           )
           if count != 1:
-              raise SystemExit("expected one locked artifact sha256 to tamper")
+            raise SystemExit("expected one locked artifact sha256 to tamper")
           path.write_text(text, encoding="utf-8")
           PY