ci: add runner config

Dockerfile

@@ -1,6 +1,13 @@
+FROM golang:alpine as builder
+
+WORKDIR /app
+COPY . .
+RUN go install github.com/gohugoio/hugo@latest
+RUN hugo --minify
+
 FROM nginx:alpine
 
-COPY ./public /usr/share/nginx/html
+COPY --from=builder /app/public /usr/share/nginx/html
 
 EXPOSE 80