Adjust Compose Watch example (#19631)

* adjust-compose-example

* adjust-compose-example

* adjust-compose-example

Author: aevesdocker

content/compose/file-watch.md

@@ -63,6 +63,11 @@ FROM node:18-alpine
 RUN useradd -ms /bin/sh -u 1001 app
 USER app
 
+# Install dependencies
+WORKDIR /app
+COPY package.json package.lock .
+RUN npm install
+
 # Copy source files into application directory
 COPY --chown=app:app . /app
 ```