feat: make sure our debian repo is WAI (#351)

We want to be sure it's working for all the supported archs.

See https://github.com/ooni/probe/issues/1484

.github/workflows/debianrepo.yml

@@ -0,0 +1,36 @@
+# debianrepo ensures we can install on debian with the official build instructions
+name: linux
+on:
+  push:
+    branches:
+      - "master"
+      - "issue/1484"
+
+jobs:
+  test_386:
+    runs-on: "ubuntu-20.04"
+    steps:
+      - uses: actions/checkout@v2
+      - run: ./E2E/debian.sh docker i386
+
+  test_amd64:
+    runs-on: "ubuntu-20.04"
+    steps:
+      - uses: actions/checkout@v2
+      - run: ./E2E/debian.sh docker amd64
+
+  test_arm:
+    runs-on: "ubuntu-20.04"
+    steps:
+      - uses: actions/checkout@v2
+      - run: sudo apt-get update -q
+      - run: sudo apt-get install -y qemu-user-static
+      - run: ./E2E/debian.sh docker armhf
+
+  build_arm64:
+    runs-on: "ubuntu-20.04"
+    steps:
+      - uses: actions/checkout@v2
+      - run: sudo apt-get update -q
+      - run: sudo apt-get install -y qemu-user-static
+      - run: ./E2E/debian.sh docker arm64

E2E/debian.sh

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+#!/bin/sh
+# This script checks whether we can install ooniprobe on debian
+# for a specific architecture using docker and the official
+# install instructions published at https://ooni.org/install.
+
+set -e
+
+install_flow() {
+	set -x
+	export DEBIAN_FRONTEND=noninteractive
+	apt-get update
+	apt-get install --yes gnupg
+	apt-key adv --verbose --keyserver hkp://keyserver.ubuntu.com --recv-keys 'B5A08F01796E7F521861B449372D1FF271F2DD50'
+	echo "deb http://deb.ooni.org/ unstable main" | tee /etc/apt/sources.list.d/ooniprobe.list
+	apt-get update
+	apt-get install --yes ooniprobe-cli
+}
+
+docker_flow() {
+	printf "checking for docker..."
+	command -v docker || {
+		echo "not found"
+		exit 1
+	}
+	set -x
+	docker pull --platform "linux/$1" debian:stable
+	docker run --platform "linux/$1" -v "$(pwd):/ooni" -w /ooni debian:stable ./E2E/debian.sh install
+}
+
+if [ "$1" = "docker" ]; then
+	test -n "$2" || {
+		echo "usage: $0 docker {i386,amd64,armhf,arm64}" 1>&2
+		exit 1
+	}
+	docker_flow "$2"
+
+elif [ "$1" = "install" ]; then
+	install_flow
+
+else
+	echo "usage: $0 docker {i386,amd64,armhf,arm64}" 1>&2
+	echo "       $0 install" 1>&2
+	exit 1
+fi