Add APIM_KERNEL_EXISTS

Author: simonkurtz-MSFT

.devcontainer/post-start-setup.sh

@@ -51,7 +51,10 @@ else
 fi
 
 # Quick Jupyter kernel check
-if jupyter kernelspec list 2>/dev/null | grep -q "apim-samples"; then
+# Check if kernel exists and store as boolean-like variable using ternary-style
+APIM_KERNEL_EXISTS=$(jupyter kernelspec list 2>/dev/null | grep -q "apim-samples" && echo "true" || echo "false")
+
+if [ "$APIM_KERNEL_EXISTS" = "true" ]; then
     echo "   ✅ Jupyter kernel"
 else
     echo "   ⚠️  Jupyter kernel missing (fallback registration...)"