Implement Spring Boot email notification system with Docker Compose deployment

.env.example

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+# Server Configuration
+PORT=3000
+NODE_ENV=development
+
+# Email Configuration
+EMAIL_HOST=smtp.gmail.com
+EMAIL_PORT=587
+EMAIL_USER=your-email@gmail.com
+EMAIL_PASS=your-app-password
+EMAIL_FROM=noreply@yourcompany.com
+
+# Application Configuration
+APP_NAME=Executive Hiring Notification System

.gitignore

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+# Java/Maven
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+*.class
+*.jar
+*.war
+*.ear
+*.nar
+hs_err_pid*
+
+# Spring Boot
+*.log
+spring.log
+
+# Node.js (legacy files)
+node_modules/
+package-lock.json
+package.json
+index.js
+routes/
+services/
+models/
+examples/
+
+# Environment variables
+.env
+.env.local
+.env.docker
+
+# Data storage
+data/
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Coverage directory used by tools like istanbul
+coverage/
+
+# Temporary folders
+tmp/
+temp/
+
+# IDE
+.vscode/
+.idea/
+*.iml
+*.ipr
+*.iws
+.project
+.classpath
+.settings/
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Docker
+.dockerignore
+
+# SSL certificates
+ssl/
+*.pem
+*.key
+*.crt

Dockerfile

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+# Multi-stage build for optimal image size
+FROM maven:3.9.4-eclipse-temurin-17 AS build
+
+# Set working directory
+WORKDIR /app
+
+# Copy all source files
+COPY pom.xml .
+COPY src ./src
+
+# Build the application
+RUN mvn clean package -DskipTests
+
+# Production stage
+FROM eclipse-temurin:17-jre-alpine
+
+# Create app user for security
+RUN addgroup -g 1001 -S appgroup && \
+    adduser -u 1001 -S appuser -G appgroup
+
+# Set working directory
+WORKDIR /app
+
+# Copy built JAR from build stage
+COPY --from=build /app/target/email-backend-*.jar app.jar
+
+# Create data directory for JSON storage
+RUN mkdir -p /app/data && \
+    chown -R appuser:appgroup /app
+
+# Switch to non-root user
+USER appuser
+
+# Expose port
+EXPOSE 3000
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+    CMD wget --no-verbose --tries=1 --spider http://localhost:3000/health || exit 1
+
+# Run the application
+ENTRYPOINT ["java", "-jar", "app.jar"]