[build] Added Dockerfile

.dockerignore

+node_modules
+build
\ No newline at end of file

.env

 REACT_APP_VERSION=$npm_package_version
-REACT_APP_SEB_API=http://seb.localhost:81/api/
\ No newline at end of file
+REACT_APP_SEB_API=/api/
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.env.example

-REACT_APP_VERSION=$npm_package_version
-REACT_APP_SEB_API=
\ No newline at end of file

Dockerfile

+# Use node lts
+FROM node:lts
+
+# Set working directory
+WORKDIR /seb-ui/
+
+# Install dependencies
+COPY package.json ./
+COPY yarn.lock ./
+RUN yarn install
+RUN yarn global add serve
+
+# Build
+COPY . ./
+RUN yarn build
+
+# Run on port 3000
+EXPOSE 3000
+CMD serve -s build -l 3000