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