Dockerize DSNP-gateway for Improved Deployment

[enddynayn]

Description
To streamline our deployment process, we need to dockerize our application.

Acceptance Criteria

• Add Dockerfile
• Base image specs: node: 18
• Working Directory: /urs/src/app
• See below...
• Update package.json to start
• Update README.MD Documentation

Example

FROM node:18 AS builder

WORKDIR /usr/src/app

COPY package*.json ./

RUN npm install

COPY . .

# Build the application
RUN npm run build

# Production stage
FROM node:18

WORKDIR /usr/src/app

COPY --from=builder /usr/src/app/dist ./dist
COPY package*.json ./

RUN npm install --only=production

CMD ["sh", "-c", "npm run start"]