Make the build work in Docker as well

Dockerfile

@@ -1,19 +1,10 @@
 FROM debian AS builder
 
-RUN apt-get update \
- && apt-get install -y curl jq git \
- && ARCH=$(uname -m | sed -e 's/x86_/amd/' -e 's/aarch/arm/') \
- && echo ">>> ARCH $ARCH" \
- && URL=$(curl -sS -H 'Accept: appliction/vnd.github.v3+json' https://api.github.com/repos/gohugoio/hugo/releases/latest | jq -r '.assets[] | select(.name | test("hugo_[^e].*linux-'$ARCH'.tar.gz")) | .browser_download_url') \
- && echo ">>> URL $URL" \
- && curl -sSL -o hugo.tar.gz $URL \
- && tar -C /usr/local/bin -xf hugo.tar.gz hugo
+RUN apt-get update && apt-get install -y curl git
 
 COPY . /site
-
 WORKDIR /site
-
-RUN hugo
+RUN ./build.sh
 
 FROM nginx