Initial commit of new flow

docker/html/Dockerfile

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+FROM debian:stable-20211011-slim AS builder
+
+ADD https://github.com/validator/validator/releases/download/20.6.30/vnu.linux.zip .
+ADD https://github.com/validator/validator/releases/download/20.6.30/vnu.linux.zip.sha1 .
+COPY "build.sh" "/build.sh"
+
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+RUN apt-get update && apt-get install --no-install-recommends -y \
+       unzip=6.0-26 \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/* \
+    && echo "$(cat vnu.linux.zip.sha1) vnu.linux.zip" | sha1sum -c - \
+    && unzip ./vnu.linux.zip \
+    && rm ./vnu.linux.zip* \
+    && apt-get purge -y --auto-remove unzip \
+    && chmod +x /build.sh \
+	&& addgroup --gid 1000 hugo && adduser --gid 1000 hugo
+
+USER hugo

docker/html/build.sh

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+#!/bin/sh
+
+find result/ -type f -name '*.html' -print0 | xargs -0 -n1 /nix/store/p7adf8zk6akdbjr60vb98fajxp5aaa7i-html-tidy-5.8.0/bin/tidy 2>/dev/null