add support of compose watch for Docker Desktop walkthroughs (#7)

Signed-off-by: Guillaume Lours <705411+glours@users.noreply.github.com>

Author: glours

app/Dockerfile

@@ -21,16 +21,21 @@ WORKDIR /usr/src/app
 RUN --mount=type=bind,source=package.json,target=package.json \
     --mount=type=bind,source=package-lock.json,target=package-lock.json \
     --mount=type=cache,target=/root/.npm \
-    npm ci --omit=dev
+    npm ci --include=dev
 
-# Run the application as a non-root user.
-USER node
+# install nodemon for hot-reloading
+RUN npm install -g nodemon
 
 # Copy the rest of the source files into the image.
 COPY . .
 
+
+# Run the application as a non-root user.
+RUN  chown -R node /usr/src/app
+USER node
+
 # Expose the port that the application listens on.
 EXPOSE 3000
 
-# Run the application.
-CMD npm start
+# Run the application in dev mode to use with Compose watch feature
+CMD npm run dev