Add dockerfile for prod deploy.

Dockerfile.prod

@@ -0,0 +1,34 @@
+# STEP 1: Build the website's files
+FROM golang:alpine AS build-website
+
+WORKDIR /src
+
+COPY . /src/
+
+RUN cd /src
+
+ENV GO111MODULE=on
+RUN go get -u github.com/gohugoio/hugo@v0.69.0
+
+RUN hugo --minify
+
+# STEP 2: Get a binary for the static-web-server
+FROM golang:alpine AS build-webserver
+
+RUN apk update && apk upgrade && \
+    apk add --no-cache git
+
+RUN go get -u git.simplesystems.tech/SimpleSystems/static-web-server
+
+# STEP 3: Combine static files and binary on fresh alpine image
+FROM alpine:latest
+
+WORKDIR /app
+
+# Copy over static website files
+COPY --from=build-website /src/public /app/public
+
+# Copy over static-web-server
+COPY --from=build-webserver /go/bin/static-web-server /app/
+
+ENTRYPOINT ["./static-web-server", "-rootDir", "public", "-port", "80", "-redirect"]