Fix docker file for successfull build

Dockerfile

@@ -1,4 +1,21 @@
-FROM gatsbyjs/gatsby:onbuild as build
+FROM node:alpine AS builder
+RUN apk add --no-cache libc6-compat
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci
+COPY . .
+ENV GATSBY_TELEMETRY_DISABLED 1
+RUN npm run build
 
-FROM gatsbyjs/gatsby
+FROM node:alpine AS runner
-COPY --from=build /app/public /pub
+WORKDIR /app
+RUN addgroup -g 1001 -S gatsby
+RUN adduser -S gatsby -u 1001
+COPY --from=builder /app/public ./public
+COPY --from=builder /app/node_modules ./node_modules
+COPY --from=builder /app/package.json ./package.json
+USER gatsby
+EXPOSE 9000
+ENV PORT 9000
+ENV GATSBY_TELEMETRY_DISABLED 1
+CMD ["node_modules/.bin/gatsby", "serve"]