Add generator for debian images

.github/workflows/images.yml

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+name: Generate Images
+
+on:
+  workflow_dispatch:
+
+jobs:
+  debian-images:
+    name: Debian Images
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+
+    - name: debootstrap
+      run: ./tools/qemu-debian-img/generate-images.sh
+
+    - name: Archive images
+      uses: actions/upload-artifact@v3
+      with:
+        name: debian-images
+        path: /home/runner/work/out-of-tree/out-of-tree/tools/qemu-debian-img/*.tar.gz

tools/qemu-debian-img/.gitignore

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+*
+!.gitignore
+!Dockerfile.template
+!generate-images.sh

tools/qemu-debian-img/Dockerfile.template

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+FROM debian:_VERSION_
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN echo 'deb [check-valid-until=no trusted=yes] _REPOSITORY_ _RELEASE_ main contrib' > /etc/apt/sources.list
+RUN echo 'deb [check-valid-until=no trusted=yes] _REPOSITORY_ _RELEASE_-updates main contrib' >> /etc/apt/sources.list
+
+RUN apt-get update
+RUN apt-get remove -y iputils-ping
+RUN apt-get autoremove -y
+RUN apt-get install -y debootstrap qemu-utils
+
+ENV TMPDIR=/tmp/debian
+ENV IMAGEDIR=/tmp/image
+ENV IMAGE=/shared/out_of_tree_debian__VERSION_.img
+ENV REPOSITORY=_REPOSITORY_
+ENV RELEASE=_RELEASE_
+
+RUN mkdir $IMAGEDIR
+
+# Must be executed with --privileged because of /dev/loop
+CMD debootstrap --include=openssh-server,policykit-1 \
+	$RELEASE $TMPDIR $REPOSITORY && \
+	/shared/setup.sh $TMPDIR && \
+	qemu-img create $IMAGE 2G && \
+	mkfs.ext4 -F $IMAGE && \
+	mount -o loop $IMAGE $IMAGEDIR && \
+	cp -a $TMPDIR/* $IMAGEDIR/ && \
+	umount $IMAGEDIR

tools/qemu-debian-img/generate-images.sh

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+#!/usr/bin/env bash
+
+set -eux
+
+cd $(dirname $(realpath $0))
+
+for version in 7 8 9 10 11; do
+    if [[ $version -eq 7 ]]; then
+	release=wheezy
+	last_version=7.11.0
+    fi
+    if [[ $version -eq 8 ]]; then
+	release=jessie
+	last_version=8.11.1
+    fi
+    if [[ $version -eq 9 ]]; then
+	release=stretch
+	last_version=9.13.0
+    fi
+    if [[ $version -eq 10 ]]; then
+	release=buster
+	last_version=10.13.0
+    fi
+    if [[ $version -eq 11 ]]; then
+	release=bullseye
+	last_version=11.6.0
+    fi
+
+    mkdir $version
+
+    sed "s/_VERSION_/${version}/" Dockerfile.template >> $version/Dockerfile
+    sed -i "s/_RELEASE_/${release}/" $version/Dockerfile
+
+    repository=$(wget -q -O - https://cdimage.debian.org/mirror/cdimage/archive/${last_version}/amd64/jigdo-bd/debian-${last_version}-amd64-BD-1.jigdo | gunzip | awk -F= '/snapshot.debian.org/ {print $2}' | cut -d ' ' -f 1)
+
+    sed -i "s;_REPOSITORY_;${repository};" $version/Dockerfile
+
+    docker build -t gen-debian${version}-image $version
+    rm -rf $version
+
+    docker run --privileged -v $(pwd):/shared -t gen-debian${version}-image
+
+    tar -Szcf out_of_tree_debian_${version}.img.tar.gz out_of_tree_debian_${version}.img
+done