added docker files

Dockerfile

+FROM openjdk:11-jre-slim
+COPY target/warehouse-0.0.1-SNAPSHOT.jar /usr/local/lib/warehouse.jar
+EXPOSE 8080
+ENTRYPOINT ["java","-jar","/usr/local/lib/warehouse.jar"]
+
+
+# BELOW IS FOR LOCAL TESTING
+
+# FROM maven:3.6.0-jdk-11-slim AS build
+# COPY src /home/app/src
+# COPY pom.xml /home/app
+# RUN mvn -f /home/app/pom.xml clean package -DskipTests
+#
+# FROM openjdk:11-jre-slim
+# COPY --from=build /home/app/target/warehouse-0.0.1-SNAPSHOT.jar /usr/local/lib/warehouse.jar
+# EXPOSE 8080
+# ENTRYPOINT ["java","-jar","/usr/local/lib/warehouse.jar"]

frontend/Dockerfile

+FROM node:13.12.0-alpine as build
+WORKDIR /app
+ENV PATH /app/node_modules/.bin:$PATH
+COPY package.json ./
+COPY package-lock.json ./
+RUN npm ci
+RUN npm install react-scripts@3.4.1 -g
+COPY . ./
+RUN npm run build
+
+FROM nginx:stable-alpine
+COPY --from=build /app/build /usr/share/nginx/html
+COPY nginx/nginx.conf /etc/nginx/conf.d/default.conf
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]