Bake workflow

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

hack/dockerfiles/authors.Dockerfile

@@ -0,0 +1,33 @@
+# syntax=docker/dockerfile:1.3-labs
+
+FROM alpine:3.14 AS gen
+RUN apk add --no-cache git
+WORKDIR /src
+RUN --mount=type=bind,target=. <<EOT
+#!/usr/bin/env bash
+set -e
+mkdir /out
+# see also ".mailmap" for how email addresses and names are deduplicated
+{
+  echo "# This file lists all individuals having contributed content to the repository."
+  echo "# For how it is generated, see hack/dockerfiles/authors.Dockerfile."
+  echo
+  git log --format='%aN <%aE>' | LC_ALL=C.UTF-8 sort -uf
+} > /out/AUTHORS
+cat /out/AUTHORS
+EOT
+
+FROM scratch AS update
+COPY --from=gen /out /
+
+FROM gen AS validate
+RUN --mount=type=bind,target=.,rw <<EOT
+set -e
+git add -A
+cp -rf /out/* .
+if [ -n "$(git status --porcelain -- AUTHORS)" ]; then
+  echo >&2 'ERROR: Authors result differs. Please update with "make authors"'
+  git status --porcelain -- AUTHORS
+  exit 1
+fi
+EOT