Ensure npm link uses --save

To prevent npm install from overriding `npm link` outcomes or getting
errors when running `npm ls` we must be sure we do always add `--save`

Related: npm/cli#2380
Related: ansible/ansible-language-server#130

.github/workflows/ci.yaml

@@ -94,7 +94,7 @@ jobs:
         run: |
           set -ex
           mv ansible-language-server ..
-          npm link ../ansible-language-server
+          npm link --save ../ansible-language-server
           pushd ../ansible-language-server
           npm ci
           npm run compile