ARG vs ENV
| Feature | ARG (Build-time) | ENV (Runtime) |
|---|---|---|
| Available at build-time? | ✅ Yes | ✅ Yes |
| Available in the running container? | ❌ No | ✅ Yes |
| Can be overridden at build-time? | ✅ Yes (–build-arg) | ❌ No |
| Can be overridden at runtime? | ❌ No | ✅ Yes (-e) |
| Included in final image? | ❌ No | ✅ Yes |