Add docker environment

.dockerignore

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+.git
+node_modules
+packages/*/node_modules
+packages/*/dist
+plugins/*/node_modules
+plugins/*/dist

Dockerfile

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+FROM node:12 as builder
+
+WORKDIR /app
+
+COPY package.json yarn.lock .yarnrc .npmrc /app/
+COPY .yarn /app/.yarn
+COPY packages /app/packages
+COPY plugins /app/plugins
+
+RUN yarn
+
+COPY . .
+
+RUN yarn build
+
+CMD ["yarn", "workspace", "@spotify-backstage/app", "start"]