Task/deploy railway (#10)

* add docker file for deployment

* add docker file for deployment

Author: Puneethkumarck

deploy/docker/Dockerfile

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+# Step 1: Build the application using Gradle from the root directory
+FROM eclipse-temurin:21.0.4_7-jdk AS build
+
+WORKDIR /app
+
+# Copy the Gradle wrapper and necessary files from the root
+COPY gradlew gradlew
+COPY gradle gradle
+COPY build.gradle settings.gradle ./
+COPY gradle.properties gradle.properties
+
+# Copy the source code for all modules (from root)
+COPY .. .
+
+# Grant execution permission to the Gradle wrapper
+RUN chmod +x gradlew
+
+# Run the Gradle build from the root (including skipping tests if necessary)
+RUN ./gradlew clean build --no-daemon -x test
+
+# Step 2: Create a minimal image with JRE and the built app
+FROM eclipse-temurin:21.0.4_7-jre
+
+WORKDIR /opt
+
+# Copy the built JAR from the build stage
+COPY --from=build /app/trading-app/build/libs/trading-app.jar /opt/app.jar
+
+# Copy the entrypoint script
+COPY ./deploy/docker/entrypoint.sh /opt/entrypoint.sh
+
+# Grant execution permission to the entrypoint script
+RUN chmod +x /opt/entrypoint.sh
+
+# Expose port 8080
+EXPOSE 8080
+
+# Set the entrypoint
+ENTRYPOINT ["/opt/entrypoint.sh"]

deploy/docker/entrypoint.sh

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+#!/bin/bash
+
+set -e
+
+exec java -jar /opt/app.jar