added docker file and docker compose for containerization

docker-compose.yaml

@@ -0,0 +1,30 @@
+version: '1'
+
+services:
+  app:
+    image: 'assignment_v2.0:latest'
+    build:
+      context: .
+    container_name: assignment-app
+    depends_on:
+      - db
+    environment:
+      - POSTGRES_USER=postgres
+      - POSTGRES_PASSWORD=postgres
+      - SPRING_DATASOURCE_URL=jdbc:postgresql://db:5432/postgres
+      - SPRING_DATASOURCE_USERNAME=postgres
+      - SPRING_DATASOURCE_PASSWORD=postgres
+      - SPRING_JPA_HIBERNATE_DDL_AUTO=update
+
+    ports:
+      - "8080:8080"
+
+  db:
+    image: postgres
+    container_name: db
+    environment:
+      - POSTGRES_USER=postgres
+      - POSTGRES_PASSWORD=postgres
+      - POSTGRES_DB=postgres
+    ports:
+      - "5435:5435"

dockerfile

@@ -0,0 +1,28 @@
+
+#############################
+#   Builder
+#############################
+FROM openjdk:21-jdk as builder
+WORKDIR /usr/src/app
+ADD . .
+COPY .mvn/ .mvn
+COPY mvnw pom.xml ./
+RUN ./mvnw clean package -DskipTests
+
+#############################
+#   Server
+#############################
+FROM openjdk:21-jdk
+
+ENV APP_HOME /srv
+
+
+COPY --from=builder /usr/src/app/target/assignment-*.jar $APP_HOME/assignment.jar
+
+WORKDIR $APP_HOME
+
+RUN useradd app
+USER app
+
+CMD ["java", "-ea", "-jar", "/srv/assignment.jar"]
+EXPOSE 8080/tcp