Use pre-built jakejarvis/hugo-docker image to speed up action

Dockerfile

@@ -1,61 +1,4 @@
-# Hugo doesn't require Go to run, *except* if you're using Hugo Modules. It's
-# much easier to install Node on the Go base image than vice-versa.
-FROM golang:1.15-alpine
-
-# the following version can be overridden at image build time with --build-arg
-ARG HUGO_VERSION=0.79.0
-# remove/comment the following line completely to build with vanilla Hugo:
-ARG HUGO_EXTENDED=1
-
-LABEL "com.github.actions.name"="Hugo Build"
-LABEL "com.github.actions.description"="Hugo as an action, with extended support and legacy versions"
-LABEL "com.github.actions.icon"="edit"
-LABEL "com.github.actions.color"="gray-dark"
-
-LABEL version="${HUGO_VERSION}${HUGO_EXTENDED:+-extended}"
-LABEL repository="https://github.com/jakejarvis/hugo-build-action"
-LABEL homepage="https://jarv.is/"
-LABEL maintainer="Jake Jarvis <jake@jarv.is>"
-
-# only install libc6-compat & libstdc++ if we're building extended Hugo
-# https://gitlab.com/yaegashi/hugo/commit/22f0d5cbd6114210ba7835468facbdee60609aa2
-RUN apk update && \
-    apk add --no-cache \
-      ca-certificates \
-      git \
-      nodejs \
-      npm \
-      yarn \
-      python3 \
-      py3-pip \
-      ruby \
-      ${HUGO_EXTENDED:+libc6-compat libstdc++} && \
-    update-ca-certificates
-
-# download Hugo and miscellaneous optional dependencies
-RUN npm install --global postcss postcss-cli autoprefixer @babel/core @babel/cli && \
-    pip3 install --upgrade Pygments==2.* && \
-    gem install asciidoctor && \
-    wget https://github.com/gohugoio/hugo/releases/download/v${HUGO_VERSION}/hugo_${HUGO_EXTENDED:+extended_}${HUGO_VERSION}_Linux-64bit.tar.gz && \
-    wget https://github.com/gohugoio/hugo/releases/download/v${HUGO_VERSION}/hugo_${HUGO_VERSION}_checksums.txt && \
-    grep hugo_${HUGO_EXTENDED:+extended_}${HUGO_VERSION}_Linux-64bit.tar.gz hugo_${HUGO_VERSION}_checksums.txt | sha256sum -c && \
-    tar xf hugo_${HUGO_EXTENDED:+extended_}${HUGO_VERSION}_Linux-64bit.tar.gz && \
-    mv ./hugo /usr/local/bin/ && \
-    chmod +x /usr/local/bin/hugo && \
-    rm -rf hugo_* LICENSE README.md
-
-# fix potential stack size problems on Alpine
-# https://github.com/microsoft/vscode-dev-containers/blob/fb63f7e016877e13535d4116b458d8f28012e87f/containers/hugo/.devcontainer/Dockerfile#L19
-RUN go get github.com/yaegashi/muslstack && \
-    muslstack -s 0x800000 /usr/local/bin/hugo
-
-# verify everything's OK, fail otherwise
-RUN hugo version && \
-    hugo env && \
-    postcss --version && \
-    autoprefixer --version && \
-    babel --version && \
-    pygmentize -V && \
-    asciidoctor --version
+# https://github.com/jakejarvis/hugo-docker
+FROM ghcr.io/jakejarvis/hugo-extended:0.79.0
 
 ENTRYPOINT ["hugo"]

action.yml

@@ -3,7 +3,7 @@ description: "Hugo as an action, with extended support and legacy versions"
 author: jakejarvis
 runs:
   using: docker
-  image: Dockerfile
+  image: docker://ghcr.io/jakejarvis/hugo-extended:0.79.0
 branding:
   icon: edit
   color: gray-dark