Initial PR for setting up circleCI and dockerfile

.circleci/config.yml

@@ -0,0 +1,21 @@
+version: 2.1
+
+# using circleci orbs for easy understanding and clean ci setup
+orbs:
+  aws-ecs: circleci/[email protected]
+  aws-ecr: circleci/[email protected]
+
+workflows:
+  build-and-deploy:
+    jobs:
+      - aws-ecr/build-and-push-image:
+          repo: "calculator"
+          # using commit information as tag
+          tag: "latest"
+
+      - aws-ecs/deploy-service-update:
+          # making sure deployment is run only after successful image build and push
+          requires:
+            - aws-ecr/build-and-push-image
+          family: "calculator"
+          cluster: "calculator"

Dockerfile

@@ -0,0 +1,22 @@
+# Base image
+FROM node:16-alpine
+
+# Add group and user to avoid root user usage for security reasons.
+RUN addgroup calgroup
+RUN adduser -D caluser calgroup
+
+# copy source code and set up work directory
+RUN mkdir /calculator
+COPY . /calculator
+WORKDIR /calculator
+
+# change ownership of work directory and use created user
+RUN chown -R caluser:calgroup /calculator
+USER caluser
+
+#intimate docker which port will be used
+EXPOSE 3000
+
+# Run application
+RUN npm install
+CMD ["npm", "start"]