add docker build

.dockerignore

@@ -0,0 +1,5 @@
+.cache/
+node_modules/
+public/
+Dockerfile
+.dockerignore

Dockerfile

@@ -0,0 +1,11 @@
+FROM node:latest as build
+
+WORKDIR /usr/src/app
+ADD . /usr/src/app
+
+ENV GATSBY_TELEMETRY_DISABLED 1
+RUN yarn
+RUN yarn build
+
+FROM gatsbyjs/gatsby
+COPY --from=build /usr/src/app/public /pub