Fix node install.

.github/workflows/ci.yml

@@ -1,12 +1,7 @@
 name: Moodle plugin CI for master
 
-# Controls when the action will run. Triggers the workflow on push or pull request
-# events but only for the master branch
-on:
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
+# Controls when the action will run.
+on: [push, pull_request]
 
 jobs:
   citest:
@@ -83,7 +78,6 @@ jobs:
       - name: Install Moodle
         run: |
           mkdir ~/.npm-global
-          npm config set prefix '~/.npm-global'
           export PATH=~/.npm-global/bin:$PATH
           source ~/.profile
           moodle-plugin-ci install -vvv --plugin ./plugin --db-host=127.0.0.1