run backend docker commands as node instead of root

backend/Dockerfile

@@ -3,6 +3,8 @@ FROM node:16-alpine AS build
 
 WORKDIR /app
 
+ENV npm_config_cache /home/node/.npm
+
 COPY package*.json ./
 RUN npm ci --only-production
 
@@ -14,18 +16,23 @@ FROM node:16-alpine
 
 WORKDIR /app
 
+ENV npm_config_cache /home/node/.npm
+
 COPY package*.json ./
 RUN npm ci --only-production
 
 COPY --from=build /app .
+RUN chown -R node:node /app
 
 RUN apk add --no-cache bash curl && curl -1sLf \
   'https://dl.cloudsmith.io/public/infisical/infisical-cli/setup.alpine.sh' | bash \
   && apk add infisical=0.8.1
 
-HEALTHCHECK --interval=10s --timeout=3s --start-period=10s \  
+HEALTHCHECK --interval=10s --timeout=3s --start-period=10s \
   CMD node healthcheck.js
 
 EXPOSE 4000
 
-CMD ["npm", "run", "start"]
+USER node
+
+CMD ["npm", "run", "start"]