Add package-lock.json and enable npm cache in CI (#5693)

* Add package-lock.json to the repo for reproducible build

* Enable the npm cache in CI

Author: vincentfretin

.github/workflows/ci.yml

@@ -24,10 +24,8 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix['node-version'] }}
-# Enabling the cache reduces the "Install dependencies" step by 1m30,
-# but you need package-lock.json in the repo.
-#          cache: 'npm'
-#          cache-dependency-path: 'package-lock.json'
+          cache: 'npm'
+          cache-dependency-path: 'package-lock.json'
 
       - name: Install dependencies
         run: npm install

.gitignore

@@ -8,4 +8,3 @@ gh-pages/
 karma.conf.js
 node_modules
 npm-debug.log*
-package-lock.json