Create Dockerfile

Dockerfile

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+# Multi-stage Dockerfile for Coral Server deployment on Render
+
+# Stage 1: Build stage
+FROM gradle:8.5-jdk17 AS build
+
+# Set working directory
+WORKDIR /app
+
+# Clone the Coral Server repository
+RUN git clone https://github.com/Coral-Protocol/coral-server.git .
+
+# Copy any custom configuration if needed
+# COPY application.yaml src/main/resources/
+
+# Build the application
+RUN gradle build --no-daemon -x test
+
+# Stage 2: Runtime stage
+FROM openjdk:17-jdk-slim AS runtime
+
+# Install required packages
+RUN apt-get update && apt-get install -y \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Set working directory
+WORKDIR /app
+
+# Copy built application from build stage
+COPY --from=build /app/build/libs/*.jar app.jar
+
+# Create config directory and copy resources
+RUN mkdir -p /config
+COPY --from=build /app/src/main/resources/* /config/
+
+# Set environment variables
+ENV JAVA_OPTS="-Xmx512m -Xms256m"
+ENV SERVER_PORT=${PORT:-5555}
+
+# Expose the port (Render will provide PORT environment variable)
+EXPOSE ${PORT:-5555}
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=60s --retries=3 \
+    CMD curl -f http://localhost:${PORT:-5555}/health || exit 1
+
+# Create a non-root user for security
+RUN useradd -r -s /bin/false coral && \
+    chown -R coral:coral /app /config
+
+USER coral
+
+# Start the application with SSE server mode
+CMD java $JAVA_OPTS -jar app.jar --sse-server-ktor ${PORT:-5555}