Add Docker

Dockerfile

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+FROM golang:1.19 as go
+
+COPY ./api /api
+WORKDIR /api
+RUN go build -o /api/main /api/*.go 
+
+FROM node as node
+
+COPY ./app /app
+WORKDIR /app
+ENV NODE_ENV=production
+RUN npm install
+RUN npm install && npm run build
+
+FROM debian
+
+COPY --from=go /api/main /main
+COPY --from=node /app/www /api/www
+
+EXPOSE 8080
+
+CMD [ "/main" ]