docs: add docker login
@@ -10,8 +10,9 @@ For example,
docker build --tag coedl/elpis:latest --tag coedl/elpis:0.96.8 .
```
-After building, push to the hub.
+After building, push to the hub. Login first
```
+docker login
docker push coedl/elpis:latest
docker push coedl/elpis:0.96.8
```
