ci(GitHub): Use npm ci instead of npm install

Use `npm ci` [1] instead of `npm install` to install the dependencies
of the Docusaurus project to ensure that exactly the versions from the
lockfile are used.

[1]: https://docs.npmjs.com/cli/v9/commands/npm-ci

Signed-off-by: Martin Nonnenmacher <[email protected]>

Author: mnonnenmacher

.github/workflows/docusaurus-deploy.yml

@@ -17,7 +17,7 @@ jobs:
           cache: npm
           cache-dependency-path: docusaurus/package-lock.json
       - name: Install dependencies
-        run: npm install
+        run: npm ci
         working-directory: docusaurus
       - name: Build website
         run: npm run build

.github/workflows/docusaurus-test.yml

@@ -17,7 +17,7 @@ jobs:
           cache: npm
           cache-dependency-path: docusaurus/package-lock.json
       - name: Install dependencies
-        run: npm install
+        run: npm ci
         working-directory: docusaurus
       - name: Test build
         run: npm run build