feat: Adding logging solution + alert for mobile phones

Dockerfile

@@ -1,17 +1,29 @@
 FROM node:20-alpine
 
+# Create non-root user/group before switching context
+RUN addgroup -S appgroup && adduser -S appuser -G appgroup
+
 WORKDIR /app
 
+# Install dependencies first for better layer caching
 COPY package.json package-lock.json ./
 RUN npm ci --omit=dev
 
+# Copy application source
 COPY server ./server
 COPY public ./public
 COPY config ./config
 
+# Drop to non-root user
+USER appuser
+
+ENV NODE_ENV=production
 ENV PORT=8080
-ENV CLICK_COOLDOWN_SECONDS=5
 
 EXPOSE 8080
 
-CMD ["node", "server/index.js"]
+# Health-check: lightweight wget is available in node:alpine
+HEALTHCHECK --interval=15s --timeout=5s --start-period=30s --retries=3 \
+  CMD wget -qO- http://localhost:8080/api/config > /dev/null || exit 1
+
+CMD ["node", "server/index.js"]